18640412 has 24 divisors (see below), whose sum is σ = 37384704. Its totient is φ = 7966512.

The previous prime is 18640409. The next prime is 18640421. The reversal of 18640412 is 21404681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12953 + ... + 14319.

It is an arithmetic number, because the mean of its divisors is an integer number (1557696).

Almost surely, 2^18640412 is an apocalyptic number.

It is an amenable number.

18640412 is an abundant number, since it is smaller than the sum of its proper divisors (18744292).

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

18640412 is a wasteful number, since it uses less digits than its factorization.

18640412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865 (or 1863 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 18640412 is about 4317.4543425496. The cubic root of 18640412 is about 265.1460545295.

The spelling of 18640412 in words is "eighteen million, six hundred forty thousand, four hundred twelve".