399667988455 has 8 divisors (see below), whose sum is σ = 482036113152. Its totient is φ = 318111372768.

The previous prime is 399667988431. The next prime is 399667988483. The reversal of 399667988455 is 554889766993.

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 399667988455 - 2⁷ = 399667988327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202876167 + ... + 202878136.

It is an arithmetic number, because the mean of its divisors is an integer number (60254514144).

Almost surely, 2^399667988455 is an apocalyptic number.

399667988455 is a deficient number, since it is larger than the sum of its proper divisors (82368124697).

399667988455 is a wasteful number, since it uses less digits than its factorization.

399667988455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405754505.

The product of its digits is 3527193600, while the sum is 79.

The spelling of 399667988455 in words is "three hundred ninety-nine billion, six hundred sixty-seven million, nine hundred eighty-eight thousand, four hundred fifty-five".