399400539 has 8 divisors (see below), whose sum is σ = 560562240. Its totient is φ = 252252936.

The previous prime is 399400511. The next prime is 399400541. The reversal of 399400539 is 935004993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 399400539 - 2¹² = 399396443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399400539.

It is not an unprimeable number, because it can be changed into a prime (399400549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3503457 + ... + 3503570.

It is an arithmetic number, because the mean of its divisors is an integer number (70070280).

Almost surely, 2^399400539 is an apocalyptic number.

399400539 is a deficient number, since it is larger than the sum of its proper divisors (161161701).

399400539 is a wasteful number, since it uses less digits than its factorization.

399400539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007049.

The product of its (nonzero) digits is 131220, while the sum is 42.

The square root of 399400539 is about 19985.0078558904. The cubic root of 399400539 is about 736.4380435030.

The spelling of 399400539 in words is "three hundred ninety-nine million, four hundred thousand, five hundred thirty-nine".