399861041 has 4 divisors (see below), whose sum is σ = 400509732. Its totient is φ = 399212352.

The previous prime is 399861031. The next prime is 399861043. The reversal of 399861041 is 140168993.

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 10627600 + 389233441 = 3260^2 + 19729^2 .

It is a cyclic number.

It is not a de Polignac number, because 399861041 - 2⁶ = 399860977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399861041.

It is not an unprimeable number, because it can be changed into a prime (399861043) 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, 323420 + ... + 324653.

It is an arithmetic number, because the mean of its divisors is an integer number (100127433).

Almost surely, 2^399861041 is an apocalyptic number.

It is an amenable number.

399861041 is a deficient number, since it is larger than the sum of its proper divisors (648691).

399861041 is an equidigital number, since it uses as much as digits as its factorization.

399861041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648690.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 399861041 is about 19996.5257232350. The cubic root of 399861041 is about 736.7209682905.

The spelling of 399861041 in words is "three hundred ninety-nine million, eight hundred sixty-one thousand, forty-one".