38449440 has 72 divisors (see below), whose sum is σ = 131213628. Its totient is φ = 10252800.

The previous prime is 38449429. The next prime is 38449441. The reversal of 38449440 is 4494483.

It can be written as a sum of positive squares in 2 ways, for example, as 34433424 + 4016016 = 5868^2 + 2004^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 38449395 and 38449404.

It is not an unprimeable number, because it can be changed into a prime (38449441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11911 + ... + 14790.

Almost surely, 2^38449440 is an apocalyptic number.

38449440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

38449440 is an abundant number, since it is smaller than the sum of its proper divisors (92764188).

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

38449440 is a wasteful number, since it uses less digits than its factorization.

38449440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26722 (or 26711 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 38449440 is about 6200.7612435894. The cubic root of 38449440 is about 337.5177933006.

The spelling of 38449440 in words is "thirty-eight million, four hundred forty-nine thousand, four hundred forty".