1393400556 has 60 divisors (see below), whose sum is σ = 3661662312. Its totient is φ = 462039552.

The previous prime is 1393400537. The next prime is 1393400557. The reversal of 1393400556 is 6550043931.

1393400556 is a `hidden beast` number, since 13 + 93 + 4 + 0 + 0 + 556 = 666.

1393400556 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1393400556² = 3883130218922218272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1393400556.

It is not an unprimeable number, because it can be changed into a prime (1393400557) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 51391 + ... + 73673.

Almost surely, 2^1393400556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1393400556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1830831156).

1393400556 is an abundant number, since it is smaller than the sum of its proper divisors (2268261756).

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

1393400556 is a wasteful number, since it uses less digits than its factorization.

1393400556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22492 (or 22481 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 1393400556 is about 37328.2809140737. The cubic root of 1393400556 is about 1116.9283811410.

The spelling of 1393400556 in words is "one billion, three hundred ninety-three million, four hundred thousand, five hundred fifty-six".