399430241 has 24 divisors (see below), whose sum is σ = 475743744. Its totient is φ = 328311360.

The previous prime is 399430219. The next prime is 399430243. The reversal of 399430241 is 142034993.

It is a de Polignac number, because none of the positive numbers 2^k-399430241 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399430243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1791056 + ... + 1791278.

It is an arithmetic number, because the mean of its divisors is an integer number (19822656).

Almost surely, 2^399430241 is an apocalyptic number.

It is an amenable number.

399430241 is a deficient number, since it is larger than the sum of its proper divisors (76313503).

399430241 is an equidigital number, since it uses as much as digits as its factorization.

399430241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 399430241 is about 19985.7509491137. The cubic root of 399430241 is about 736.4562984780.

The spelling of 399430241 in words is "three hundred ninety-nine million, four hundred thirty thousand, two hundred forty-one".