399077871 has 4 divisors (see below), whose sum is σ = 532103832. Its totient is φ = 266051912.

The previous prime is 399077837. The next prime is 399077897. The reversal of 399077871 is 178770993.

It is a happy number.

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 399077871 - 2⁹ = 399077359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399077801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66512976 + ... + 66512981.

It is an arithmetic number, because the mean of its divisors is an integer number (133025958).

Almost surely, 2^399077871 is an apocalyptic number.

399077871 is a deficient number, since it is larger than the sum of its proper divisors (133025961).

399077871 is a wasteful number, since it uses less digits than its factorization.

399077871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133025960.

The product of its (nonzero) digits is 666792, while the sum is 51.

The square root of 399077871 is about 19976.9334733837. The cubic root of 399077871 is about 736.2396720379.

The spelling of 399077871 in words is "three hundred ninety-nine million, seventy-seven thousand, eight hundred seventy-one".