18691354 has 12 divisors (see below), whose sum is σ = 30817962. Its totient is φ = 8495960.

The previous prime is 18691339. The next prime is 18691391. The reversal of 18691354 is 45319681.

It can be written as a sum of positive squares in only one way, i.e., 18688329 + 3025 = 4323^2 + 55^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38377 + ... + 38860.

Almost surely, 2^18691354 is an apocalyptic number.

18691354 is a deficient number, since it is larger than the sum of its proper divisors (12126608).

18691354 is a wasteful number, since it uses less digits than its factorization.

18691354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77261 (or 77250 counting only the distinct ones).

The product of its digits is 25920, while the sum is 37.

The square root of 18691354 is about 4323.3498586166. The cubic root of 18691354 is about 265.3873722386.

It can be divided in two parts, 1869 and 1354, that added together give a palindrome (3223).

The spelling of 18691354 in words is "eighteen million, six hundred ninety-one thousand, three hundred fifty-four".