18935642 has 16 divisors (see below), whose sum is σ = 31646592. Its totient is φ = 8423520.

The previous prime is 18935641. The next prime is 18935663. The reversal of 18935642 is 24653981.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18935596 and 18935605.

It is not an unprimeable number, because it can be changed into a prime (18935641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8123 + ... + 10190.

It is an arithmetic number, because the mean of its divisors is an integer number (1977912).

Almost surely, 2^18935642 is an apocalyptic number.

18935642 is a deficient number, since it is larger than the sum of its proper divisors (12710950).

18935642 is a wasteful number, since it uses less digits than its factorization.

18935642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18373.

The product of its digits is 51840, while the sum is 38.

The square root of 18935642 is about 4351.5103125237. The cubic root of 18935642 is about 266.5385380992.

The spelling of 18935642 in words is "eighteen million, nine hundred thirty-five thousand, six hundred forty-two".