18061938 has 24 divisors (see below), whose sum is σ = 39421200. Its totient is φ = 5976504.

The previous prime is 18061937. The next prime is 18061949. The reversal of 18061938 is 83916081.

18061938 is a `hidden beast` number, since 1 + 8 + 0 + 619 + 38 = 666.

It is not an unprimeable number, because it can be changed into a prime (18061937) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1108 + ... + 6111.

It is an arithmetic number, because the mean of its divisors is an integer number (1642550).

Almost surely, 2^18061938 is an apocalyptic number.

18061938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18061938 is an abundant number, since it is smaller than the sum of its proper divisors (21359262).

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

18061938 is a wasteful number, since it uses less digits than its factorization.

18061938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7366 (or 7363 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18061938 is about 4249.9338818386. The cubic root of 18061938 is about 262.3743943293.

The spelling of 18061938 in words is "eighteen million, sixty-one thousand, nine hundred thirty-eight".