18961428 has 12 divisors (see below), whose sum is σ = 44243360. Its totient is φ = 6320472.

The previous prime is 18961417. The next prime is 18961441. The reversal of 18961428 is 82416981.

It is a tau number, because it is divible by the number of its divisors (12).

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, 790048 + ... + 790071.

Almost surely, 2^18961428 is an apocalyptic number.

It is an amenable number.

18961428 is an abundant number, since it is smaller than the sum of its proper divisors (25281932).

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

18961428 is a wasteful number, since it uses less digits than its factorization.

18961428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580126 (or 1580124 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 18961428 is about 4354.4721838588. The cubic root of 18961428 is about 266.6594713336.

The spelling of 18961428 in words is "eighteen million, nine hundred sixty-one thousand, four hundred twenty-eight".