1400820 has 48 divisors (see below), whose sum is σ = 4034688. Its totient is φ = 362880.

The previous prime is 1400809. The next prime is 1400821. The reversal of 1400820 is 280041.

Added to its reverse (280041) it gives a triangular number (1680861 = T₁₈₃₃).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1400820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1905 + ... + 2535.

It is an arithmetic number, because the mean of its divisors is an integer number (84056).

2^1400820 is an apocalyptic number.

1400820 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 1400820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2017344).

1400820 is an abundant number, since it is smaller than the sum of its proper divisors (2633868).

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

1400820 is a wasteful number, since it uses less digits than its factorization.

1400820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1400820 is about 1183.5624191398. The cubic root of 1400820 is about 111.8907310151.

Adding to 1400820 its reverse (280041), we get a palindrome (1680861).

It can be divided in two parts, 14008 and 20, that added together give a triangular number (14028 = T₁₆₇).

The spelling of 1400820 in words is "one million, four hundred thousand, eight hundred twenty".