12451890 has 64 divisors (see below), whose sum is σ = 33022080. Its totient is φ = 2979840.

The previous prime is 12451877. The next prime is 12451903. The reversal of 12451890 is 9815421.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12451877) and next prime (12451903).

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 31816 + ... + 32204.

It is an arithmetic number, because the mean of its divisors is an integer number (515970).

Almost surely, 2^12451890 is an apocalyptic number.

12451890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12451890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16511040).

12451890 is an abundant number, since it is smaller than the sum of its proper divisors (20570190).

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

12451890 is a wasteful number, since it uses less digits than its factorization.

12451890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 12451890 is about 3528.7235652570. The cubic root of 12451890 is about 231.7813164263.

The spelling of 12451890 in words is "twelve million, four hundred fifty-one thousand, eight hundred ninety".