398994786 has 24 divisors (see below), whose sum is σ = 876333900. Its totient is φ = 131175936.

The previous prime is 398994781. The next prime is 398994809. The reversal of 398994786 is 687499893.

It can be written as a sum of positive squares in 2 ways, for example, as 385533225 + 13461561 = 19635^2 + 3669^2 .

It is not an unprimeable number, because it can be changed into a prime (398994781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150511 + ... + 153138.

Almost surely, 2^398994786 is an apocalyptic number.

398994786 is an abundant number, since it is smaller than the sum of its proper divisors (477339114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398994786 is a wasteful number, since it uses less digits than its factorization.

398994786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303730 (or 303727 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 63.

The square root of 398994786 is about 19974.8538417682. The cubic root of 398994786 is about 736.1885753112.

The spelling of 398994786 in words is "three hundred ninety-eight million, nine hundred ninety-four thousand, seven hundred eighty-six".