38397440 has 80 divisors (see below), whose sum is σ = 94132368. Its totient is φ = 15015936.

The previous prime is 38397427. The next prime is 38397451. The reversal of 38397440 is 4479383.

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

It is a junction number, because it is equal to n+sod(n) for n = 38397394 and 38397403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135539 + ... + 135821.

Almost surely, 2^38397440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38397440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47066184).

38397440 is an abundant number, since it is smaller than the sum of its proper divisors (55734928).

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

38397440 is an equidigital number, since it uses as much as digits as its factorization.

38397440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 38397440 is about 6196.5667913773. The cubic root of 38397440 is about 337.3655687748.

The spelling of 38397440 in words is "thirty-eight million, three hundred ninety-seven thousand, four hundred forty".