402522140 has 24 divisors (see below), whose sum is σ = 864956400. Its totient is φ = 157264128.

The previous prime is 402522139. The next prime is 402522187. The reversal of 402522140 is 41225204.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 233165 + ... + 234884.

It is an arithmetic number, because the mean of its divisors is an integer number (36039850).

Almost surely, 2^402522140 is an apocalyptic number.

It is an amenable number.

402522140 is an abundant number, since it is smaller than the sum of its proper divisors (462434260).

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

402522140 is a wasteful number, since it uses less digits than its factorization.

402522140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468101 (or 468099 counting only the distinct ones).

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

The square root of 402522140 is about 20062.9544185297. The cubic root of 402522140 is about 738.3516634458.

Adding to 402522140 its reverse (41225204), we get a palindrome (443747344).

The spelling of 402522140 in words is "four hundred two million, five hundred twenty-two thousand, one hundred forty".