387744520 has 32 divisors (see below), whose sum is σ = 882235800. Its totient is φ = 153353728.

The previous prime is 387744509. The next prime is 387744521. The reversal of 387744520 is 25447783.

It can be written as a sum of positive squares in 4 ways, for example, as 350363524 + 37380996 = 18718^2 + 6114^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (387744521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50899 + ... + 58018.

Almost surely, 2^387744520 is an apocalyptic number.

It is an amenable number.

387744520 is an abundant number, since it is smaller than the sum of its proper divisors (494491280).

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

387744520 is a wasteful number, since it uses less digits than its factorization.

387744520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109017 (or 109013 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 40.

The square root of 387744520 is about 19691.2295197634. The cubic root of 387744520 is about 729.2031838619.

The spelling of 387744520 in words is "three hundred eighty-seven million, seven hundred forty-four thousand, five hundred twenty".