18077838 has 16 divisors (see below), whose sum is σ = 36749136. Its totient is φ = 5927040.

The previous prime is 18077821. The next prime is 18077849. The reversal of 18077838 is 83877081.

It is a self number, because there is not a number n which added to its sum of digits gives 18077838.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24331 + ... + 25062.

It is an arithmetic number, because the mean of its divisors is an integer number (2296821).

Almost surely, 2^18077838 is an apocalyptic number.

18077838 is an abundant number, since it is smaller than the sum of its proper divisors (18671298).

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

18077838 is a wasteful number, since it uses less digits than its factorization.

18077838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49459.

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 18077838 is about 4251.8040876785. The cubic root of 18077838 is about 262.4513615099.

It can be divided in two parts, 18077 and 838, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 18077838 in words is "eighteen million, seventy-seven thousand, eight hundred thirty-eight".