402145400 has 24 divisors (see below), whose sum is σ = 934988520. Its totient is φ = 160858080.

The previous prime is 402145379. The next prime is 402145439. The reversal of 402145400 is 4541204.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1005164 + ... + 1005563.

It is an arithmetic number, because the mean of its divisors is an integer number (38957855).

Almost surely, 2^402145400 is an apocalyptic number.

402145400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402145400 is an abundant number, since it is smaller than the sum of its proper divisors (532843120).

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

402145400 is a wasteful number, since it uses less digits than its factorization.

402145400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010743 (or 2010734 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 402145400 is about 20053.5632743909. The cubic root of 402145400 is about 738.1212384941.

Adding to 402145400 its reverse (4541204), we get a palindrome (406686604).

The spelling of 402145400 in words is "four hundred two million, one hundred forty-five thousand, four hundred".