18940577 has 4 divisors (see below), whose sum is σ = 19343616. Its totient is φ = 18537540.

The previous prime is 18940573. The next prime is 18940583. The reversal of 18940577 is 77504981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77504981 = 2347 ⋅33023.

It is a cyclic number.

It is not a de Polignac number, because 18940577 - 2² = 18940573 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18940573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201449 + ... + 201542.

It is an arithmetic number, because the mean of its divisors is an integer number (4835904).

Almost surely, 2^18940577 is an apocalyptic number.

It is an amenable number.

18940577 is a deficient number, since it is larger than the sum of its proper divisors (403039).

18940577 is an equidigital number, since it uses as much as digits as its factorization.

18940577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403038.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 18940577 is about 4352.0773200852. The cubic root of 18940577 is about 266.5616911462.

The spelling of 18940577 in words is "eighteen million, nine hundred forty thousand, five hundred seventy-seven".