399967771 has 8 divisors (see below), whose sum is σ = 458109920. Its totient is φ = 342076608.

The previous prime is 399967753. The next prime is 399967793. The reversal of 399967771 is 177769993.

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 399967771 - 2¹³ = 399959579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399967741) 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, 59316 + ... + 65713.

It is an arithmetic number, because the mean of its divisors is an integer number (57263740).

Almost surely, 2^399967771 is an apocalyptic number.

399967771 is a deficient number, since it is larger than the sum of its proper divisors (58142149).

399967771 is a wasteful number, since it uses less digits than its factorization.

399967771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125493.

The product of its digits is 4500846, while the sum is 58.

The square root of 399967771 is about 19999.1942587695. The cubic root of 399967771 is about 736.7865104214.

The spelling of 399967771 in words is "three hundred ninety-nine million, nine hundred sixty-seven thousand, seven hundred seventy-one".