388491680 has 24 divisors (see below), whose sum is σ = 917811972. Its totient is φ = 155396608.

The previous prime is 388491671. The next prime is 388491739. The reversal of 388491680 is 86194883.

It can be written as a sum of positive squares in 2 ways, for example, as 359633296 + 28858384 = 18964^2 + 5372^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1213877 + ... + 1214196.

Almost surely, 2^388491680 is an apocalyptic number.

It is an amenable number.

388491680 is an abundant number, since it is smaller than the sum of its proper divisors (529320292).

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

388491680 is a wasteful number, since it uses less digits than its factorization.

388491680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2428088 (or 2428080 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 47.

The square root of 388491680 is about 19710.1922872406. The cubic root of 388491680 is about 729.6712600002.

The spelling of 388491680 in words is "three hundred eighty-eight million, four hundred ninety-one thousand, six hundred eighty".