399977 has 8 divisors (see below), whose sum is σ = 416640. Its totient is φ = 383760.

The previous prime is 399953. The next prime is 399979. The reversal of 399977 is 779993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399977 - 2⁶ = 399913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4778 + ... + 4860.

It is an arithmetic number, because the mean of its divisors is an integer number (52080).

2³⁹⁹⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

399977 is a deficient number, since it is larger than the sum of its proper divisors (16663).

399977 is an equidigital number, since it uses as much as digits as its factorization.

399977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223.

The product of its digits is 107163, while the sum is 44.

The square root of 399977 is about 632.4373486757. The cubic root of 399977 is about 73.6792177337.

It can be divided in two parts, 39997 and 7, that added together give a palindrome (40004).

The spelling of 399977 in words is "three hundred ninety-nine thousand, nine hundred seventy-seven".