399959895 has 16 divisors (see below), whose sum is σ = 653552640. Its totient is φ = 208773024.

The previous prime is 399959869. The next prime is 399959897. The reversal of 399959895 is 598959993.

It is not a de Polignac number, because 399959895 - 2⁷ = 399959767 is a prime.

It is a super-2 number, since 2×399959895² = 319935835216822050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399959897) 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, 282955 + ... + 284364.

It is an arithmetic number, because the mean of its divisors is an integer number (40847040).

Almost surely, 2^399959895 is an apocalyptic number.

399959895 is a deficient number, since it is larger than the sum of its proper divisors (253592745).

399959895 is a wasteful number, since it uses less digits than its factorization.

399959895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567374.

The product of its digits is 35429400, while the sum is 66.

The square root of 399959895 is about 19998.9973498673. The cubic root of 399959895 is about 736.7816742245.

The spelling of 399959895 in words is "three hundred ninety-nine million, nine hundred fifty-nine thousand, eight hundred ninety-five".