399776241 has 4 divisors (see below), whose sum is σ = 533034992. Its totient is φ = 266517492.

The previous prime is 399776239. The next prime is 399776243. The reversal of 399776241 is 142677993.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (399776239) and next prime (399776243).

It is not a de Polignac number, because 399776241 - 2¹ = 399776239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399776243) 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, 66629371 + ... + 66629376.

It is an arithmetic number, because the mean of its divisors is an integer number (133258748).

Almost surely, 2^399776241 is an apocalyptic number.

It is an amenable number.

399776241 is a deficient number, since it is larger than the sum of its proper divisors (133258751).

399776241 is a wasteful number, since it uses less digits than its factorization.

399776241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133258750.

The product of its digits is 571536, while the sum is 48.

The square root of 399776241 is about 19994.4052424672. The cubic root of 399776241 is about 736.6688849010.

The spelling of 399776241 in words is "three hundred ninety-nine million, seven hundred seventy-six thousand, two hundred forty-one".