399691395181 has 8 divisors (see below), whose sum is σ = 449151534720. Its totient is φ = 352904776752.

The previous prime is 399691395121. The next prime is 399691395253. The reversal of 399691395181 is 181593196993.

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 399691395181 - 2¹¹ = 399691393133 is a prime.

It is a super-2 number, since 2×399691395181² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399691395121) 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, 668379961 + ... + 668380558.

It is an arithmetic number, because the mean of its divisors is an integer number (56143941840).

Almost surely, 2^399691395181 is an apocalyptic number.

It is an amenable number.

399691395181 is a deficient number, since it is larger than the sum of its proper divisors (49460139539).

399691395181 is a wasteful number, since it uses less digits than its factorization.

399691395181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336760555.

The product of its digits is 14171760, while the sum is 64.

The spelling of 399691395181 in words is "three hundred ninety-nine billion, six hundred ninety-one million, three hundred ninety-five thousand, one hundred eighty-one".