18961436 has 12 divisors (see below), whose sum is σ = 35735112. Its totient is φ = 8751408.

The previous prime is 18961417. The next prime is 18961441. The reversal of 18961436 is 63416981.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18961436.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182270 + ... + 182373.

It is an arithmetic number, because the mean of its divisors is an integer number (2977926).

Almost surely, 2^18961436 is an apocalyptic number.

It is an amenable number.

18961436 is a deficient number, since it is larger than the sum of its proper divisors (16773676).

18961436 is a wasteful number, since it uses less digits than its factorization.

18961436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364660 (or 364658 counting only the distinct ones).

The product of its digits is 31104, while the sum is 38.

The square root of 18961436 is about 4354.4731024545. The cubic root of 18961436 is about 266.6595088356.

The spelling of 18961436 in words is "eighteen million, nine hundred sixty-one thousand, four hundred thirty-six".