400639099 has 16 divisors (see below), whose sum is σ = 465638400. Its totient is φ = 337618944.

The previous prime is 400639079. The next prime is 400639103. The reversal of 400639099 is 990936004.

It is a cyclic number.

It is not a de Polignac number, because 400639099 - 2⁷ = 400638971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400639039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140712 + ... + 143530.

It is an arithmetic number, because the mean of its divisors is an integer number (29102400).

Almost surely, 2^400639099 is an apocalyptic number.

400639099 is a deficient number, since it is larger than the sum of its proper divisors (64999301).

400639099 is a wasteful number, since it uses less digits than its factorization.

400639099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3162.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 400639099 is about 20015.9710981006. The cubic root of 400639099 is about 737.1985010637.

The spelling of 400639099 in words is "four hundred million, six hundred thirty-nine thousand, ninety-nine".