399000626 has 16 divisors (see below), whose sum is σ = 610245144. Its totient is φ = 195617664.

The previous prime is 399000583. The next prime is 399000649. The reversal of 399000626 is 626000993.

It is a Cunningham number, because it is equal to 19975²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 399000625 + 1 = 19975^2 + 1^2 .

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, 17360 + ... + 33156.

Almost surely, 2^399000626 is an apocalyptic number.

399000626 is a deficient number, since it is larger than the sum of its proper divisors (211244518).

399000626 is a wasteful number, since it uses less digits than its factorization.

399000626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16045.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 399000626 is about 19975.0000250313. Note that the first 4 decimals coincide. The cubic root of 399000626 is about 736.1921671045.

The spelling of 399000626 in words is "three hundred ninety-nine million, six hundred twenty-six", and thus it is an aban number.