400664015 has 8 divisors (see below), whose sum is σ = 482572608. Its totient is φ = 319347360.

The previous prime is 400663999. The next prime is 400664023. The reversal of 400664015 is 510466004.

It is a happy number.

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

It is not a de Polignac number, because 400664015 - 2⁴ = 400663999 is a prime.

It is a Duffinian number.

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, 146492 + ... + 149201.

It is an arithmetic number, because the mean of its divisors is an integer number (60321576).

Almost surely, 2^400664015 is an apocalyptic number.

400664015 is a deficient number, since it is larger than the sum of its proper divisors (81908593).

400664015 is a wasteful number, since it uses less digits than its factorization.

400664015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295969.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 400664015 is about 20016.5934914011. The cubic root of 400664015 is about 737.2137830279.

The spelling of 400664015 in words is "four hundred million, six hundred sixty-four thousand, fifteen".