18942215 has 8 divisors (see below), whose sum is σ = 22951968. Its totient is φ = 15006240.

The previous prime is 18942211. The next prime is 18942223. The reversal of 18942215 is 51224981.

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

It is not a de Polignac number, because 18942215 - 2² = 18942211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18942211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17876 + ... + 18905.

It is an arithmetic number, because the mean of its divisors is an integer number (2868996).

Almost surely, 2^18942215 is an apocalyptic number.

18942215 is a deficient number, since it is larger than the sum of its proper divisors (4009753).

18942215 is a wasteful number, since it uses less digits than its factorization.

18942215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36889.

The product of its digits is 5760, while the sum is 32.

The square root of 18942215 is about 4352.2655020116. The cubic root of 18942215 is about 266.5693750984.

The spelling of 18942215 in words is "eighteen million, nine hundred forty-two thousand, two hundred fifteen".