38640140 has 72 divisors (see below), whose sum is σ = 101978016. Its totient is φ = 12038400.

The previous prime is 38640139. The next prime is 38640143. The reversal of 38640140 is 4104683.

It is not an unprimeable number, because it can be changed into a prime (38640143) 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 23 ways as a sum of consecutive naturals, for example, 15800 + ... + 18080.

Almost surely, 2^38640140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38640140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50989008).

38640140 is an abundant number, since it is smaller than the sum of its proper divisors (63337876).

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

38640140 is a wasteful number, since it uses less digits than its factorization.

38640140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2319 (or 2306 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 38640140 is about 6216.1193682232. The cubic root of 38640140 is about 338.0748757476.

The spelling of 38640140 in words is "thirty-eight million, six hundred forty thousand, one hundred forty".