388377990 has 320 divisors, whose sum is σ = 1405071360. Its totient is φ = 74338560.

The previous prime is 388377919. The next prime is 388377991. The reversal of 388377990 is 99773883.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388377991) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 810571 + ... + 811049.

It is an arithmetic number, because the mean of its divisors is an integer number (4390848).

Almost surely, 2^388377990 is an apocalyptic number.

388377990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 388377990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (702535680).

388377990 is an abundant number, since it is smaller than the sum of its proper divisors (1016693370).

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

388377990 is a wasteful number, since it uses less digits than its factorization.

388377990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The square root of 388377990 is about 19707.3080353457. The cubic root of 388377990 is about 729.6000749329.

The spelling of 388377990 in words is "three hundred eighty-eight million, three hundred seventy-seven thousand, nine hundred ninety".