399651841 has 4 divisors (see below), whose sum is σ = 417028032. Its totient is φ = 382275652.

The previous prime is 399651839. The next prime is 399651913. The reversal of 399651841 is 148156993.

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 399651841 - 2¹ = 399651839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399651791 and 399651800.

It is not an unprimeable number, because it can be changed into a prime (399651341) 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, 8688061 + ... + 8688106.

It is an arithmetic number, because the mean of its divisors is an integer number (104257008).

Almost surely, 2^399651841 is an apocalyptic number.

It is an amenable number.

399651841 is a deficient number, since it is larger than the sum of its proper divisors (17376191).

399651841 is a wasteful number, since it uses less digits than its factorization.

399651841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17376190.

The product of its digits is 233280, while the sum is 46.

The square root of 399651841 is about 19991.2941301958. The cubic root of 399651841 is about 736.5924662223.

The spelling of 399651841 in words is "three hundred ninety-nine million, six hundred fifty-one thousand, eight hundred forty-one".