399482191 has 4 divisors (see below), whose sum is σ = 399729352. Its totient is φ = 399235032.

The previous prime is 399482177. The next prime is 399482219. The reversal of 399482191 is 191284993.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 399482191 - 2¹¹ = 399480143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399482131) 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, 121140 + ... + 124393.

It is an arithmetic number, because the mean of its divisors is an integer number (99932338).

Almost surely, 2^399482191 is an apocalyptic number.

399482191 is a deficient number, since it is larger than the sum of its proper divisors (247161).

399482191 is a wasteful number, since it uses less digits than its factorization.

399482191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247160.

The product of its digits is 139968, while the sum is 46.

The square root of 399482191 is about 19987.0505828149. The cubic root of 399482191 is about 736.4882249926.

The spelling of 399482191 in words is "three hundred ninety-nine million, four hundred eighty-two thousand, one hundred ninety-one".