399748607 has 4 divisors (see below), whose sum is σ = 403706616. Its totient is φ = 395790600.

The previous prime is 399748603. The next prime is 399748637. The reversal of 399748607 is 706847993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399748607 - 2² = 399748603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399748603) 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, 1978853 + ... + 1979054.

It is an arithmetic number, because the mean of its divisors is an integer number (100926654).

Almost surely, 2^399748607 is an apocalyptic number.

399748607 is a deficient number, since it is larger than the sum of its proper divisors (3958009).

399748607 is a wasteful number, since it uses less digits than its factorization.

399748607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3958008.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 399748607 is about 19993.7141872139. The cubic root of 399748607 is about 736.6519107582.

The spelling of 399748607 in words is "three hundred ninety-nine million, seven hundred forty-eight thousand, six hundred seven".