399029481 has 6 divisors (see below), whose sum is σ = 576375930. Its totient is φ = 266019648.

The previous prime is 399029479. The next prime is 399029503. The reversal of 399029481 is 184920993.

It can be written as a sum of positive squares in only one way, i.e., 396806400 + 2223081 = 19920^2 + 1491^2 .

It is not a de Polignac number, because 399029481 - 2¹ = 399029479 is a prime.

It is a super-2 number, since 2×399029481² = 318449053414258722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399029441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22168296 + ... + 22168313.

It is an arithmetic number, because the mean of its divisors is an integer number (96062655).

Almost surely, 2^399029481 is an apocalyptic number.

It is an amenable number.

399029481 is a deficient number, since it is larger than the sum of its proper divisors (177346449).

399029481 is a wasteful number, since it uses less digits than its factorization.

399029481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44336615 (or 44336612 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 399029481 is about 19975.7222898197. The cubic root of 399029481 is about 736.2099133698.

The spelling of 399029481 in words is "three hundred ninety-nine million, twenty-nine thousand, four hundred eighty-one".