399939275 has 6 divisors (see below), whose sum is σ = 495924732. Its totient is φ = 319951400.

The previous prime is 399939251. The next prime is 399939299. The reversal of 399939275 is 572939993.

It is an interprime number because it is at equal distance from previous prime (399939251) and next prime (399939299).

It is not a de Polignac number, because 399939275 - 2¹⁰ = 399938251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399939275.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7998761 + ... + 7998810.

It is an arithmetic number, because the mean of its divisors is an integer number (82654122).

Almost surely, 2^399939275 is an apocalyptic number.

399939275 is a deficient number, since it is larger than the sum of its proper divisors (95985457).

399939275 is a wasteful number, since it uses less digits than its factorization.

399939275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15997581 (or 15997576 counting only the distinct ones).

The product of its digits is 4133430, while the sum is 56.

The square root of 399939275 is about 19998.4818173780. The cubic root of 399939275 is about 736.7690123723.

The spelling of 399939275 in words is "three hundred ninety-nine million, nine hundred thirty-nine thousand, two hundred seventy-five".