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BaseRepresentation
bin10101111000
31220212
4111320
521100
610252
74040
oct2570
91825
101400
111063
12988
13839
14720
15635
hex578

1400 has 24 divisors (see below), whose sum is σ = 3720. Its totient is φ = 480.

The previous prime is 1399. The next prime is 1409. The reversal of 1400 is 41.

1400 = 112 + 122 + ... + 172.

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

1400 is an undulating number in base 7.

It is a plaindrome in base 16.

It is a nialpdrome in base 5, base 12 and base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 197 + ... + 203.

It is an arithmetic number, because the mean of its divisors is an integer number (155).

1400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1860).

1400 is an abundant number, since it is smaller than the sum of its proper divisors (2320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1400 is a wasteful number, since it uses less digits than its factorization.

1400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23 (or 14 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 1400 is about 37.4165738677. The cubic root of 1400 is about 11.1868894208.

Adding to 1400 its reverse (41), we get a palindrome (1441).

The spelling of 1400 in words is "one thousand, four hundred", and thus it is an iban number.