398947720 has 32 divisors (see below), whose sum is σ = 898536600. Its totient is φ = 159418368.

The previous prime is 398947697. The next prime is 398947723. The reversal of 398947720 is 27749893.

It can be written as a sum of positive squares in 4 ways, for example, as 100280196 + 298667524 = 10014^2 + 17282^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (398947723) 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, 40216 + ... + 49144.

Almost surely, 2^398947720 is an apocalyptic number.

It is an amenable number.

398947720 is an abundant number, since it is smaller than the sum of its proper divisors (499588880).

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

398947720 is a wasteful number, since it uses less digits than its factorization.

398947720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10057 (or 10053 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 49.

The square root of 398947720 is about 19973.6756757488. The cubic root of 398947720 is about 736.1596268845.

The spelling of 398947720 in words is "three hundred ninety-eight million, nine hundred forty-seven thousand, seven hundred twenty".