18261946 has 8 divisors (see below), whose sum is σ = 27415584. Its totient is φ = 9123420.

The previous prime is 18261937. The next prime is 18261949. The reversal of 18261946 is 64916281.

It is a happy number.

18261946 is a nontrivial binomial coefficient, being equal to C(6044, 2).

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

It is not an unprimeable number, because it can be changed into a prime (18261949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 6043.

It is an arithmetic number, because the mean of its divisors is an integer number (3426948).

Almost surely, 2^18261946 is an apocalyptic number.

18261946 is the 6043-rd triangular number and also the 3022-nd hexagonal number.

18261946 is the 2015-th centered nonagonal number.

18261946 is a deficient number, since it is larger than the sum of its proper divisors (9153638).

18261946 is a wasteful number, since it uses less digits than its factorization.

18261946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7556.

The product of its digits is 20736, while the sum is 37.

The square root of 18261946 is about 4273.3998174755. The cubic root of 18261946 is about 263.3393048193.

It can be divided in two parts, 182 and 61946, that added together give a triangular number (62128 = T₃₅₂).

The spelling of 18261946 in words is "eighteen million, two hundred sixty-one thousand, nine hundred forty-six".