400109642 has 8 divisors (see below), whose sum is σ = 608386116. Its totient is φ = 197314272.

The previous prime is 400109629. The next prime is 400109669. The reversal of 400109642 is 246901004.

It can be written as a sum of positive squares in 2 ways, for example, as 343694521 + 56415121 = 18539^2 + 7511^2 .

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

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, 1370093 + ... + 1370384.

Almost surely, 2^400109642 is an apocalyptic number.

400109642 is a deficient number, since it is larger than the sum of its proper divisors (208276474).

400109642 is a wasteful number, since it uses less digits than its factorization.

400109642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740552.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 400109642 is about 20002.7408621919. The cubic root of 400109642 is about 736.8736143416.

The spelling of 400109642 in words is "four hundred million, one hundred nine thousand, six hundred forty-two".