12381390 has 64 divisors (see below), whose sum is σ = 37739520. Its totient is φ = 2829600.

The previous prime is 12381379. The next prime is 12381409. The reversal of 12381390 is 9318321.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1386 + ... + 5165.

It is an arithmetic number, because the mean of its divisors is an integer number (589680).

Almost surely, 2^12381390 is an apocalyptic number.

12381390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12381390 is an abundant number, since it is smaller than the sum of its proper divisors (25358130).

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

12381390 is a wasteful number, since it uses less digits than its factorization.

12381390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6574 (or 6568 counting only the distinct ones).

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

The square root of 12381390 is about 3518.7199377046. The cubic root of 12381390 is about 231.3430558044.

It can be divided in two parts, 1238 and 1390, that added together give a triangular number (2628 = T₇₂).

The spelling of 12381390 in words is "twelve million, three hundred eighty-one thousand, three hundred ninety".