18642424 has 8 divisors (see below), whose sum is σ = 34954560. Its totient is φ = 9321208.

The previous prime is 18642391. The next prime is 18642427. The reversal of 18642424 is 42424681.

It is a tau number, because it is divible by the number of its divisors (8).

18642424 is a modest number, since divided by 2424 gives 1864 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18642427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1165144 + ... + 1165159.

It is an arithmetic number, because the mean of its divisors is an integer number (4369320).

Almost surely, 2^18642424 is an apocalyptic number.

It is an amenable number.

18642424 is a deficient number, since it is larger than the sum of its proper divisors (16312136).

18642424 is a wasteful number, since it uses less digits than its factorization.

18642424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330309 (or 2330305 counting only the distinct ones).

The product of its digits is 12288, while the sum is 31.

The square root of 18642424 is about 4317.6873439377. The cubic root of 18642424 is about 265.1555939229.

The spelling of 18642424 in words is "eighteen million, six hundred forty-two thousand, four hundred twenty-four".