399488281 has 8 divisors (see below), whose sum is σ = 424598720. Its totient is φ = 374786352.

The previous prime is 399488273. The next prime is 399488291. The reversal of 399488281 is 182884993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399488281 - 2³ = 399488273 is a prime.

It is a super-2 number, since 2×399488281² = 319181773312669922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399488231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100110 + ... + 104023.

It is an arithmetic number, because the mean of its divisors is an integer number (53074840).

Almost surely, 2^399488281 is an apocalyptic number.

It is an amenable number.

399488281 is a deficient number, since it is larger than the sum of its proper divisors (25110439).

399488281 is a wasteful number, since it uses less digits than its factorization.

399488281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204255.

The product of its digits is 995328, while the sum is 52.

The square root of 399488281 is about 19987.2029308755. The cubic root of 399488281 is about 736.4919674961.

The spelling of 399488281 in words is "three hundred ninety-nine million, four hundred eighty-eight thousand, two hundred eighty-one".