18977642 has 8 divisors (see below), whose sum is σ = 29384832. Its totient is φ = 9182700.

The previous prime is 18977639. The next prime is 18977723. The reversal of 18977642 is 24677981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18977593 and 18977602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152984 + ... + 153107.

It is an arithmetic number, because the mean of its divisors is an integer number (3673104).

Almost surely, 2^18977642 is an apocalyptic number.

18977642 is a deficient number, since it is larger than the sum of its proper divisors (10407190).

18977642 is a wasteful number, since it uses less digits than its factorization.

18977642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306124.

The product of its digits is 169344, while the sum is 44.

The square root of 18977642 is about 4356.3335501313. Note that the first 3 decimals coincide. The cubic root of 18977642 is about 266.7354569059.

The spelling of 18977642 in words is "eighteen million, nine hundred seventy-seven thousand, six hundred forty-two".