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1420 = 22571

1420 has 12 divisors (see below), whose sum is σ = 3024. Its totient is φ = 560.

The previous prime is 1409. The next prime is 1423. The reversal of 1420 is 241.

1420 = T9 + T10 + ... + T20.

It is a plaindrome in base 16.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1423) by changing a digit.

1420 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16 + ... + 55.

It is an arithmetic number, because the mean of its divisors is an integer number (252).

21420 is an apocalyptic number.

1420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1420 is an abundant number, since it is smaller than the sum of its proper divisors (1604).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1512).

1420 is a wasteful number, since it uses less digits than its factorization.

1420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 1420 is about 37.6828873628. The cubic root of 1420 is about 11.2399086461.

Adding to 1420 its reverse (241), we get a palindrome (1661).

The spelling of 1420 in words is "one thousand, four hundred twenty", and thus it is an iban number.

Divisors: 1 2 4 5 10 20 71 142 284 355 710 1420