388761930 has 40 divisors (see below), whose sum is σ = 1045339812. Its totient is φ = 103669632.

The previous prime is 388761887. The next prime is 388761931. The reversal of 388761930 is 39167883.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 360278361 + 28483569 = 18981^2 + 5337^2 .

It is a super-2 number, since 2×388761930² = 302271676434649800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (388761931) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 239167 + ... + 240786.

Almost surely, 2^388761930 is an apocalyptic number.

388761930 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

388761930 is an abundant number, since it is smaller than the sum of its proper divisors (656577882).

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

388761930 is a wasteful number, since it uses less digits than its factorization.

388761930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479972 (or 479963 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 388761930 is about 19717.0466855460. The cubic root of 388761930 is about 729.8404167334.

The spelling of 388761930 in words is "three hundred eighty-eight million, seven hundred sixty-one thousand, nine hundred thirty".