399260738 has 8 divisors (see below), whose sum is σ = 608709180. Its totient is φ = 196357680.

The previous prime is 399260731. The next prime is 399260767. The reversal of 399260738 is 837062993.

It can be written as a sum of positive squares in 2 ways, for example, as 315666289 + 83594449 = 17767^2 + 9143^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 399260692 and 399260701.

It is not an unprimeable number, because it can be changed into a prime (399260731) 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, 1636193 + ... + 1636436.

Almost surely, 2^399260738 is an apocalyptic number.

399260738 is a deficient number, since it is larger than the sum of its proper divisors (209448442).

399260738 is a wasteful number, since it uses less digits than its factorization.

399260738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3272692.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 399260738 is about 19981.5099029077. The cubic root of 399260738 is about 736.3521090592.

The spelling of 399260738 in words is "three hundred ninety-nine million, two hundred sixty thousand, seven hundred thirty-eight".