400639007 has 4 divisors (see below), whose sum is σ = 400680936. Its totient is φ = 400597080.

The previous prime is 400638989. The next prime is 400639021. The reversal of 400639007 is 700936004.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 400639007 - 2¹² = 400634911 is a prime.

It is a super-2 number, since 2×400639007² = 321023227859892098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400639207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1133 + ... + 28329.

It is an arithmetic number, because the mean of its divisors is an integer number (100170234).

Almost surely, 2^400639007 is an apocalyptic number.

400639007 is a deficient number, since it is larger than the sum of its proper divisors (41929).

400639007 is a wasteful number, since it uses less digits than its factorization.

400639007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41928.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 400639007 is about 20015.9687999357. The cubic root of 400639007 is about 737.1984446353.

The spelling of 400639007 in words is "four hundred million, six hundred thirty-nine thousand, seven".