399988877 has 4 divisors (see below), whose sum is σ = 412891776. Its totient is φ = 387085980.

The previous prime is 399988871. The next prime is 399988879. The reversal of 399988877 is 778889993.

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 399988877 - 2¹⁴ = 399972493 is a prime.

It is a super-2 number, since 2×399988877² = 319982203447442258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399988871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6451403 + ... + 6451464.

It is an arithmetic number, because the mean of its divisors is an integer number (103222944).

Almost surely, 2^399988877 is an apocalyptic number.

It is an amenable number.

399988877 is a deficient number, since it is larger than the sum of its proper divisors (12902899).

399988877 is a wasteful number, since it uses less digits than its factorization.

399988877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12902898.

The product of its digits is 54867456, while the sum is 68.

The square root of 399988877 is about 19999.7219230668. The cubic root of 399988877 is about 736.7994700844.

The spelling of 399988877 in words is "three hundred ninety-nine million, nine hundred eighty-eight thousand, eight hundred seventy-seven".