402155690 has 16 divisors (see below), whose sum is σ = 755353728. Its totient is φ = 153868176.

The previous prime is 402155681. The next prime is 402155693. The reversal of 402155690 is 96551204.

It is a happy number.

It is a super-2 number, since 2×402155690² = 323458397998752200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (402155693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 874022 + ... + 874481.

It is an arithmetic number, because the mean of its divisors is an integer number (47209608).

Almost surely, 2^402155690 is an apocalyptic number.

402155690 is a deficient number, since it is larger than the sum of its proper divisors (353198038).

402155690 is a wasteful number, since it uses less digits than its factorization.

402155690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1748533.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 402155690 is about 20053.8198356323. The cubic root of 402155690 is about 738.1275340634.

The spelling of 402155690 in words is "four hundred two million, one hundred fifty-five thousand, six hundred ninety".