399901934885 has 4 divisors (see below), whose sum is σ = 479882321868. Its totient is φ = 319921547904.

The previous prime is 399901934869. The next prime is 399901934899. The reversal of 399901934885 is 588439109993.

It is a Cunningham number, because it is equal to 632378²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 143964089476 + 255937845409 = 379426^2 + 505903^2 .

It is a cyclic number.

It is not a de Polignac number, because 399901934885 - 2⁴ = 399901934869 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39990193484 + ... + 39990193493.

It is an arithmetic number, because the mean of its divisors is an integer number (119970580467).

Almost surely, 2^399901934885 is an apocalyptic number.

It is an amenable number.

399901934885 is a deficient number, since it is larger than the sum of its proper divisors (79980386983).

399901934885 is an equidigital number, since it uses as much as digits as its factorization.

399901934885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79980386982.

The product of its (nonzero) digits is 75582720, while the sum is 68.

The spelling of 399901934885 in words is "three hundred ninety-nine billion, nine hundred one million, nine hundred thirty-four thousand, eight hundred eighty-five".