38749440 has 72 divisors (see below), whose sum is σ = 123768288. Its totient is φ = 10332160.

The previous prime is 38749429. The next prime is 38749441. The reversal of 38749440 is 4494783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38749441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1206 + ... + 8885.

It is an arithmetic number, because the mean of its divisors is an integer number (1719004).

Almost surely, 2^38749440 is an apocalyptic number.

38749440 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 38749440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61884144).

38749440 is an abundant number, since it is smaller than the sum of its proper divisors (85018848).

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

38749440 is a wasteful number, since it uses less digits than its factorization.

38749440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10115 (or 10101 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 38749440 is about 6224.9048185494. The cubic root of 38749440 is about 338.3933424798.

The spelling of 38749440 in words is "thirty-eight million, seven hundred forty-nine thousand, four hundred forty".