18077646 has 8 divisors (see below), whose sum is σ = 36155304. Its totient is φ = 6025880.

The previous prime is 18077641. The next prime is 18077663. The reversal of 18077646 is 64677081.

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

18077646 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18077641) 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, 1506465 + ... + 1506476.

It is an arithmetic number, because the mean of its divisors is an integer number (4519413).

Almost surely, 2^18077646 is an apocalyptic number.

18077646 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.

18077646 is a wasteful number, since it uses less digits than its factorization.

18077646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3012946.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 18077646 is about 4251.7815089677. The cubic root of 18077646 is about 262.4504323641.

It can be divided in two parts, 1807 and 7646, that added together give a triangular number (9453 = T₁₃₇).

The spelling of 18077646 in words is "eighteen million, seventy-seven thousand, six hundred forty-six".