387131780 has 24 divisors (see below), whose sum is σ = 929116608. Its totient is φ = 132730848.

The previous prime is 387131779. The next prime is 387131807. The reversal of 387131780 is 87131783.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1382474 + ... + 1382753.

It is an arithmetic number, because the mean of its divisors is an integer number (38713192).

Almost surely, 2^387131780 is an apocalyptic number.

It is an amenable number.

387131780 is an abundant number, since it is smaller than the sum of its proper divisors (541984828).

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

387131780 is a wasteful number, since it uses less digits than its factorization.

387131780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2765243 (or 2765241 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 387131780 is about 19675.6646647578. The cubic root of 387131780 is about 728.8188693597.

The spelling of 387131780 in words is "three hundred eighty-seven million, one hundred thirty-one thousand, seven hundred eighty".