18961842 has 8 divisors (see below), whose sum is σ = 37923696. Its totient is φ = 6320612.

The previous prime is 18961807. The next prime is 18961843. The reversal of 18961842 is 24816981.

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

18961842 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 18961842.

It is not an unprimeable number, because it can be changed into a prime (18961843) 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 3 ways as a sum of consecutive naturals, for example, 1580148 + ... + 1580159.

It is an arithmetic number, because the mean of its divisors is an integer number (4740462).

Almost surely, 2^18961842 is an apocalyptic number.

18961842 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18961842 is a wasteful number, since it uses less digits than its factorization.

18961842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160312.

The product of its digits is 27648, while the sum is 39.

The square root of 18961842 is about 4354.5197209336. The cubic root of 18961842 is about 266.6614120492.

The spelling of 18961842 in words is "eighteen million, nine hundred sixty-one thousand, eight hundred forty-two".