399226569 has 24 divisors (see below), whose sum is σ = 620305920. Its totient is φ = 227725344.

The previous prime is 399226567. The next prime is 399226591. The reversal of 399226569 is 965622993.

It is not a de Polignac number, because 399226569 - 2¹ = 399226567 is a prime.

It is a super-2 number, since 2×399226569² = 318763706791023522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399226567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93912 + ... + 98070.

It is an arithmetic number, because the mean of its divisors is an integer number (25846080).

Almost surely, 2^399226569 is an apocalyptic number.

It is an amenable number.

399226569 is a deficient number, since it is larger than the sum of its proper divisors (221079351).

399226569 is a wasteful number, since it uses less digits than its factorization.

399226569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4829 (or 4822 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 51.

The square root of 399226569 is about 19980.6548691478. The cubic root of 399226569 is about 736.3311026252.

The spelling of 399226569 in words is "three hundred ninety-nine million, two hundred twenty-six thousand, five hundred sixty-nine".