38491440 has 160 divisors (see below), whose sum is σ = 131033280. Its totient is φ = 9345024.

The previous prime is 38491421. The next prime is 38491441. The reversal of 38491440 is 4419483.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (38491441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 527244 + ... + 527316.

It is an arithmetic number, because the mean of its divisors is an integer number (818958).

Almost surely, 2^38491440 is an apocalyptic number.

38491440 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 38491440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65516640).

38491440 is an abundant number, since it is smaller than the sum of its proper divisors (92541840).

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

38491440 is a wasteful number, since it uses less digits than its factorization.

38491440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 38491440 is about 6204.1470001927. The cubic root of 38491440 is about 337.6406437145.

The spelling of 38491440 in words is "thirty-eight million, four hundred ninety-one thousand, four hundred forty".