399480169 has 27 divisors (see below), whose sum is σ = 464903229. Its totient is φ = 342976920.

The previous prime is 399480143. The next prime is 399480217. The reversal of 399480169 is 961084993.

The square root of 399480169 is 19987.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-399480169 is a prime.

It is a super-2 number, since 2×399480169² = 319168810848537122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399480139) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5056672 + ... + 5056750.

Almost surely, 2^399480169 is an apocalyptic number.

399480169 is the 19987-th square number.

399480169 is the 9994-th centered octagonal number.

It is an amenable number.

399480169 is a deficient number, since it is larger than the sum of its proper divisors (65423060).

399480169 is an equidigital number, since it uses as much as digits as its factorization.

399480169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 49.

The cubic root of 399480169 is about 736.4869823992.

Multiplying 399480169 by its sum of digits (49), we get a square (19574528281 = 139909²).

Multiplying 399480169 by its product of nonzero digits (419904), we get a square (167743320883776 = 12951576²).

The spelling of 399480169 in words is "three hundred ninety-nine million, four hundred eighty thousand, one hundred sixty-nine".