399447345 has 32 divisors (see below), whose sum is σ = 698120064. Its totient is φ = 193420800.

The previous prime is 399447329. The next prime is 399447353. The reversal of 399447345 is 543744993.

It is a happy number.

It is not a de Polignac number, because 399447345 - 2⁴ = 399447329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399447294 and 399447303.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226989 + ... + 228741.

It is an arithmetic number, because the mean of its divisors is an integer number (21816252).

Almost surely, 2^399447345 is an apocalyptic number.

It is an amenable number.

399447345 is a deficient number, since it is larger than the sum of its proper divisors (298672719).

399447345 is a wasteful number, since it uses less digits than its factorization.

399447345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3153.

The product of its digits is 1632960, while the sum is 48.

The square root of 399447345 is about 19986.1788493949. The cubic root of 399447345 is about 736.4668102583.

It can be divided in two parts, 399 and 447345, that added together give a palindrome (447744).

The spelling of 399447345 in words is "three hundred ninety-nine million, four hundred forty-seven thousand, three hundred forty-five".