399078599 has 16 divisors (see below), whose sum is σ = 421031520. Its totient is φ = 377731200.

The previous prime is 399078569. The next prime is 399078611. The reversal of 399078599 is 995870993.

399078599 = T₄₇₉ + T₄₈₀ + ... + T₁₃₅₇.

It is a cyclic number.

It is not a de Polignac number, because 399078599 - 2²⁰ = 398030023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399078509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 568949 + ... + 569649.

It is an arithmetic number, because the mean of its divisors is an integer number (26314470).

Almost surely, 2^399078599 is an apocalyptic number.

399078599 is a deficient number, since it is larger than the sum of its proper divisors (21952921).

399078599 is a wasteful number, since it uses less digits than its factorization.

399078599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090.

The product of its (nonzero) digits is 5511240, while the sum is 59.

The square root of 399078599 is about 19976.9516943902. The cubic root of 399078599 is about 736.2401197218.

The spelling of 399078599 in words is "three hundred ninety-nine million, seventy-eight thousand, five hundred ninety-nine".