38142640 has 20 divisors (see below), whose sum is σ = 88681824. Its totient is φ = 15257024.

The previous prime is 38142619. The next prime is 38142647. The reversal of 38142640 is 4624183.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 38142599 and 38142608.

It is not an unprimeable number, because it can be changed into a prime (38142647) 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, 238312 + ... + 238471.

Almost surely, 2^38142640 is an apocalyptic number.

It is an amenable number.

38142640 is an abundant number, since it is smaller than the sum of its proper divisors (50539184).

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

38142640 is a wasteful number, since it uses less digits than its factorization.

38142640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476796 (or 476790 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 38142640 is about 6175.9727978676. The cubic root of 38142640 is about 336.6176752335.

The spelling of 38142640 in words is "thirty-eight million, one hundred forty-two thousand, six hundred forty".