12642890 has 24 divisors (see below), whose sum is σ = 24645708. Its totient is φ = 4667520.

The previous prime is 12642881. The next prime is 12642901. The reversal of 12642890 is 9824621.

It can be written as a sum of positive squares in 6 ways, for example, as 3236401 + 9406489 = 1799^2 + 3067^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2051 + ... + 5430.

Almost surely, 2^12642890 is an apocalyptic number.

12642890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12642890 is a deficient number, since it is larger than the sum of its proper divisors (12002818).

12642890 is a wasteful number, since it uses less digits than its factorization.

12642890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7514 (or 7501 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 12642890 is about 3555.6841817012. The cubic root of 12642890 is about 232.9604088269.

The spelling of 12642890 in words is "twelve million, six hundred forty-two thousand, eight hundred ninety".