18772222 has 16 divisors (see below), whose sum is σ = 33291360. Its totient is φ = 7767648.

The previous prime is 18772183. The next prime is 18772277. The reversal of 18772222 is 22227781.

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, 22713 + ... + 23524.

It is an arithmetic number, because the mean of its divisors is an integer number (2080710).

Almost surely, 2^18772222 is an apocalyptic number.

18772222 is a deficient number, since it is larger than the sum of its proper divisors (14519138).

18772222 is a wasteful number, since it uses less digits than its factorization.

18772222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46275.

The product of its digits is 6272, while the sum is 31.

The square root of 18772222 is about 4332.6922346273. The cubic root of 18772222 is about 265.7695537437.

The spelling of 18772222 in words is "eighteen million, seven hundred seventy-two thousand, two hundred twenty-two".