18777642 has 16 divisors (see below), whose sum is σ = 40444320. Its totient is φ = 5777712.

The previous prime is 18777641. The next prime is 18777653. The reversal of 18777642 is 24677781.

It is a junction number, because it is equal to n+sod(n) for n = 18777594 and 18777603.

It is not an unprimeable number, because it can be changed into a prime (18777641) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 120292 + ... + 120447.

It is an arithmetic number, because the mean of its divisors is an integer number (2527770).

Almost surely, 2^18777642 is an apocalyptic number.

18777642 is an abundant number, since it is smaller than the sum of its proper divisors (21666678).

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

18777642 is a wasteful number, since it uses less digits than its factorization.

18777642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240757.

The product of its digits is 131712, while the sum is 42.

The square root of 18777642 is about 4333.3176666383. The cubic root of 18777642 is about 265.7951293410.

The spelling of 18777642 in words is "eighteen million, seven hundred seventy-seven thousand, six hundred forty-two".