399736797 has 4 divisors (see below), whose sum is σ = 532982400. Its totient is φ = 266491196.

The previous prime is 399736787. The next prime is 399736817. The reversal of 399736797 is 797637993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 399736797 - 2⁴ = 399736781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399736797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399736747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66622797 + ... + 66622802.

It is an arithmetic number, because the mean of its divisors is an integer number (133245600).

Almost surely, 2^399736797 is an apocalyptic number.

It is an amenable number.

399736797 is a deficient number, since it is larger than the sum of its proper divisors (133245603).

399736797 is a wasteful number, since it uses less digits than its factorization.

399736797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133245602.

The product of its digits is 13502538, while the sum is 60.

The square root of 399736797 is about 19993.4188422091. The cubic root of 399736797 is about 736.6446562449.

The spelling of 399736797 in words is "three hundred ninety-nine million, seven hundred thirty-six thousand, seven hundred ninety-seven".