38121390 has 48 divisors (see below), whose sum is σ = 101542896. Its totient is φ = 9916800.

The previous prime is 38121389. The next prime is 38121397. The reversal of 38121390 is 9312183.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38121397) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1476 + ... + 8855.

It is an arithmetic number, because the mean of its divisors is an integer number (2115477).

Almost surely, 2^38121390 is an apocalyptic number.

38121390 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

38121390 is an abundant number, since it is smaller than the sum of its proper divisors (63421506).

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

38121390 is a wasteful number, since it uses less digits than its factorization.

38121390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10385 (or 10382 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 38121390 is about 6174.2521814387. The cubic root of 38121390 is about 336.5551515557. Note that the first 3 decimals are identical.

The spelling of 38121390 in words is "thirty-eight million, one hundred twenty-one thousand, three hundred ninety".