399351069 has 12 divisors (see below), whose sum is σ = 621212956. Its totient is φ = 245754432.

The previous prime is 399351067. The next prime is 399351091. The reversal of 399351069 is 960153993.

It can be written as a sum of positive squares in 2 ways, for example, as 167184900 + 232166169 = 12930^2 + 15237^2 .

It is not a de Polignac number, because 399351069 - 2¹ = 399351067 is a prime.

It is a super-2 number, since 2×399351069² = 318962552622885522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399351067) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1706512 + ... + 1706745.

Almost surely, 2^399351069 is an apocalyptic number.

399351069 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

399351069 is a deficient number, since it is larger than the sum of its proper divisors (221861887).

399351069 is a wasteful number, since it uses less digits than its factorization.

399351069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3413276 (or 3413273 counting only the distinct ones).

The product of its (nonzero) digits is 196830, while the sum is 45.

The square root of 399351069 is about 19983.7701397909. The cubic root of 399351069 is about 736.4076370224.

The spelling of 399351069 in words is "three hundred ninety-nine million, three hundred fifty-one thousand, sixty-nine".