18772061 has 24 divisors (see below), whose sum is σ = 24259200. Its totient is φ = 14208480.

The previous prime is 18772049. The next prime is 18772069. The reversal of 18772061 is 16027781.

It is not a de Polignac number, because 18772061 - 2¹⁰ = 18771037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18772069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31040 + ... + 31638.

It is an arithmetic number, because the mean of its divisors is an integer number (1010800).

Almost surely, 2^18772061 is an apocalyptic number.

18772061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18772061 is a deficient number, since it is larger than the sum of its proper divisors (5487139).

18772061 is a wasteful number, since it uses less digits than its factorization.

18772061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 18772061 is about 4332.6736549156. The cubic root of 18772061 is about 265.7687939505.

It can be divided in two parts, 187720 and 61, that added together give a palindrome (187781).

The spelling of 18772061 in words is "eighteen million, seven hundred seventy-two thousand, sixty-one".