399703874181 has 4 divisors (see below), whose sum is σ = 532938498912. Its totient is φ = 266469249452.

The previous prime is 399703874179. The next prime is 399703874239. The reversal of 399703874181 is 181478307993.

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 399703874181 - 2¹ = 399703874179 is a prime.

It is a super-2 number, since 2×399703874181² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399703874161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66617312361 + ... + 66617312366.

It is an arithmetic number, because the mean of its divisors is an integer number (133234624728).

Almost surely, 2^399703874181 is an apocalyptic number.

It is an amenable number.

399703874181 is a deficient number, since it is larger than the sum of its proper divisors (133234624731).

399703874181 is a wasteful number, since it uses less digits than its factorization.

399703874181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133234624730.

The product of its (nonzero) digits is 9144576, while the sum is 60.

The spelling of 399703874181 in words is "three hundred ninety-nine billion, seven hundred three million, eight hundred seventy-four thousand, one hundred eighty-one".