388742140 has 12 divisors (see below), whose sum is σ = 816358536. Its totient is φ = 155496848.

The previous prime is 388742119. The next prime is 388742143. The reversal of 388742140 is 41247883.

It is a super-2 number, since 2×388742140² = 302240902823559200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 388742140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388742143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9718534 + ... + 9718573.

It is an arithmetic number, because the mean of its divisors is an integer number (68029878).

Almost surely, 2^388742140 is an apocalyptic number.

It is an amenable number.

388742140 is an abundant number, since it is smaller than the sum of its proper divisors (427616396).

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

388742140 is a wasteful number, since it uses less digits than its factorization.

388742140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19437116 (or 19437114 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 388742140 is about 19716.5448291530. The cubic root of 388742140 is about 729.8280323015.

It can be divided in two parts, 38874 and 2140, that added together give a palindrome (41014).

The spelling of 388742140 in words is "three hundred eighty-eight million, seven hundred forty-two thousand, one hundred forty".