398240784 has 60 divisors (see below), whose sum is σ = 1116685596. Its totient is φ = 132489216.

The previous prime is 398240783. The next prime is 398240797. The reversal of 398240784 is 487042893.

It can be written as a sum of positive squares in 2 ways, for example, as 377447184 + 20793600 = 19428^2 + 4560^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398240783) 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, 80692 + ... + 85484.

Almost surely, 2^398240784 is an apocalyptic number.

It is an amenable number.

398240784 is an abundant number, since it is smaller than the sum of its proper divisors (718444812).

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

398240784 is a wasteful number, since it uses less digits than its factorization.

398240784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5384 (or 5375 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 398240784 is about 19955.9711364794. The cubic root of 398240784 is about 735.7245444476.

The spelling of 398240784 in words is "three hundred ninety-eight million, two hundred forty thousand, seven hundred eighty-four".