400645602 has 80 divisors (see below), whose sum is σ = 1070669952. Its totient is φ = 109486080.

The previous prime is 400645601. The next prime is 400645633. The reversal of 400645602 is 206546004.

It is a happy number.

400645602 is a `hidden beast` number, since 40 + 0 + 64 + 560 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (400645601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18402 + ... + 33762.

Almost surely, 2^400645602 is an apocalyptic number.

400645602 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 400645602, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (535334976).

400645602 is an abundant number, since it is smaller than the sum of its proper divisors (670024350).

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

400645602 is a wasteful number, since it uses less digits than its factorization.

400645602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15405 (or 15396 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 400645602 is about 20016.1335427200. The cubic root of 400645602 is about 737.2024896709.

The spelling of 400645602 in words is "four hundred million, six hundred forty-five thousand, six hundred two".