38239640 has 16 divisors (see below), whose sum is σ = 86039280. Its totient is φ = 15295840.

The previous prime is 38239601. The next prime is 38239657. The reversal of 38239640 is 4693283.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 38239640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477956 + ... + 478035.

It is an arithmetic number, because the mean of its divisors is an integer number (5377455).

Almost surely, 2^38239640 is an apocalyptic number.

It is an amenable number.

38239640 is an abundant number, since it is smaller than the sum of its proper divisors (47799640).

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

38239640 is a wasteful number, since it uses less digits than its factorization.

38239640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956002 (or 955998 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 38239640 is about 6183.8208253474. The cubic root of 38239640 is about 336.9027828773.

The spelling of 38239640 in words is "thirty-eight million, two hundred thirty-nine thousand, six hundred forty".