399247849 has 48 divisors (see below), whose sum is σ = 546981120. Its totient is φ = 283536000.

The previous prime is 399247847. The next prime is 399247889. The reversal of 399247849 is 948742993.

It is not a de Polignac number, because 399247849 - 2¹ = 399247847 is a prime.

It is a super-2 number, since 2×399247849² = 318797689862253602, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399247849.

It is not an unprimeable number, because it can be changed into a prime (399247847) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1111932 + ... + 1112290.

It is an arithmetic number, because the mean of its divisors is an integer number (11395440).

Almost surely, 2^399247849 is an apocalyptic number.

It is an amenable number.

399247849 is a deficient number, since it is larger than the sum of its proper divisors (147733271).

399247849 is a wasteful number, since it uses less digits than its factorization.

399247849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502 (or 491 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 55.

The square root of 399247849 is about 19981.1873771305. The cubic root of 399247849 is about 736.3441852944.

The spelling of 399247849 in words is "three hundred ninety-nine million, two hundred forty-seven thousand, eight hundred forty-nine".