38899920 has 80 divisors (see below), whose sum is σ = 121777920. Its totient is φ = 10271232.

The previous prime is 38899891. The next prime is 38899937. The reversal of 38899920 is 2999883.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 38899920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25417 + ... + 26903.

It is an arithmetic number, because the mean of its divisors is an integer number (1522224).

Almost surely, 2^38899920 is an apocalyptic number.

38899920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38899920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60888960).

38899920 is an abundant number, since it is smaller than the sum of its proper divisors (82878000).

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

38899920 is a wasteful number, since it uses less digits than its factorization.

38899920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612 (or 1606 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 38899920 is about 6236.9800384481. The cubic root of 38899920 is about 338.8308168084.

The spelling of 38899920 in words is "thirty-eight million, eight hundred ninety-nine thousand, nine hundred twenty".