18961846 has 4 divisors (see below), whose sum is σ = 28442772. Its totient is φ = 9480922.

The previous prime is 18961843. The next prime is 18961847. The reversal of 18961846 is 64816981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64816981 = 3631 ⋅17851.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18961843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4740460 + ... + 4740463.

It is an arithmetic number, because the mean of its divisors is an integer number (7110693).

Almost surely, 2^18961846 is an apocalyptic number.

18961846 is a deficient number, since it is larger than the sum of its proper divisors (9480926).

18961846 is an equidigital number, since it uses as much as digits as its factorization.

18961846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9480925.

The product of its digits is 82944, while the sum is 43.

The square root of 18961846 is about 4354.5201802265. The cubic root of 18961846 is about 266.6614308000.

The spelling of 18961846 in words is "eighteen million, nine hundred sixty-one thousand, eight hundred forty-six".