399885747 has 16 divisors (see below), whose sum is σ = 564953472. Its totient is φ = 250727040.

The previous prime is 399885671. The next prime is 399885749. The reversal of 399885747 is 747588993.

It is not a de Polignac number, because 399885747 - 2¹⁸ = 399623603 is a prime.

It is a super-2 number, since 2×399885747² = 319817221307496018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399885749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119268 + ... + 122574.

It is an arithmetic number, because the mean of its divisors is an integer number (35309592).

Almost surely, 2^399885747 is an apocalyptic number.

399885747 is a deficient number, since it is larger than the sum of its proper divisors (165067725).

399885747 is a wasteful number, since it uses less digits than its factorization.

399885747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5698.

The product of its digits is 15240960, while the sum is 60.

The square root of 399885747 is about 19997.1434710061. The cubic root of 399885747 is about 736.7361411060.

The spelling of 399885747 in words is "three hundred ninety-nine million, eight hundred eighty-five thousand, seven hundred forty-seven".