401872138 has 4 divisors (see below), whose sum is σ = 602808210. Its totient is φ = 200936068.

The previous prime is 401872103. The next prime is 401872147. The reversal of 401872138 is 831278104.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 399720049 + 2152089 = 19993^2 + 1467^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100468033 + ... + 100468036.

Almost surely, 2^401872138 is an apocalyptic number.

401872138 is a deficient number, since it is larger than the sum of its proper divisors (200936072).

401872138 is a wasteful number, since it uses less digits than its factorization.

401872138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200936071.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 401872138 is about 20046.7488137104. The cubic root of 401872138 is about 737.9540135808.

The spelling of 401872138 in words is "four hundred one million, eight hundred seventy-two thousand, one hundred thirty-eight".