398438738 has 16 divisors (see below), whose sum is σ = 618309720. Its totient is φ = 192432000.

The previous prime is 398438737. The next prime is 398438771. The reversal of 398438738 is 837834893.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 350925289 + 47513449 = 18733^2 + 6893^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 398438738.

It is not an unprimeable number, because it can be changed into a prime (398438737) 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, 15773 + ... + 32336.

Almost surely, 2^398438738 is an apocalyptic number.

398438738 is a deficient number, since it is larger than the sum of its proper divisors (219870982).

398438738 is a wasteful number, since it uses less digits than its factorization.

398438738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48253.

The product of its digits is 3483648, while the sum is 53.

The square root of 398438738 is about 19960.9302889419. The cubic root of 398438738 is about 735.8464267341.

The spelling of 398438738 in words is "three hundred ninety-eight million, four hundred thirty-eight thousand, seven hundred thirty-eight".