18421072 has 10 divisors (see below), whose sum is σ = 35690858. Its totient is φ = 9210528.

The previous prime is 18421057. The next prime is 18421093. The reversal of 18421072 is 27012481.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17774656 + 646416 = 4216^2 + 804^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 575643 + ... + 575674.

Almost surely, 2^18421072 is an apocalyptic number.

It is an amenable number.

18421072 is a deficient number, since it is larger than the sum of its proper divisors (17269786).

18421072 is a wasteful number, since it uses less digits than its factorization.

18421072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151325 (or 1151319 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 18421072 is about 4291.9776327469. The cubic root of 18421072 is about 264.1019655099.

The spelling of 18421072 in words is "eighteen million, four hundred twenty-one thousand, seventy-two".