12387690 has 108 divisors (see below), whose sum is σ = 38186694. Its totient is φ = 2778048.

The previous prime is 12387673. The next prime is 12387701. The reversal of 12387690 is 9678321.

12387690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 11716929 + 670761 = 3423^2 + 819^2 .

It is a super-2 number, since 2×12387690² = 306909727072200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 233704 + ... + 233756.

Almost surely, 2^12387690 is an apocalyptic number.

12387690 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 12387690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19093347).

12387690 is an abundant number, since it is smaller than the sum of its proper divisors (25799004).

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

12387690 is a wasteful number, since it uses less digits than its factorization.

12387690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 12387690 is about 3519.6150357674. The cubic root of 12387690 is about 231.3822871056.

The spelling of 12387690 in words is "twelve million, three hundred eighty-seven thousand, six hundred ninety".