402172990 has 8 divisors (see below), whose sum is σ = 723911400. Its totient is φ = 160869192.

The previous prime is 402172919. The next prime is 402173021. The reversal of 402172990 is 99271204.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×402172990² = 323486227771080200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20108640 + ... + 20108659.

It is an arithmetic number, because the mean of its divisors is an integer number (90488925).

Almost surely, 2^402172990 is an apocalyptic number.

402172990 is a deficient number, since it is larger than the sum of its proper divisors (321738410).

402172990 is a wasteful number, since it uses less digits than its factorization.

402172990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40217306.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 402172990 is about 20054.2511702631. The cubic root of 402172990 is about 738.1381182091.

The spelling of 402172990 in words is "four hundred two million, one hundred seventy-two thousand, nine hundred ninety".