18121922 has 16 divisors (see below), whose sum is σ = 33456192. Its totient is φ = 7169040.

The previous prime is 18121921. The next prime is 18121973. The reversal of 18121922 is 22912181.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 18121891 and 18121900.

It is not an unprimeable number, because it can be changed into a prime (18121921) 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, 49604 + ... + 49967.

It is an arithmetic number, because the mean of its divisors is an integer number (2091012).

Almost surely, 2^18121922 is an apocalyptic number.

18121922 is a deficient number, since it is larger than the sum of its proper divisors (15334270).

18121922 is a wasteful number, since it uses less digits than its factorization.

18121922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99593.

The product of its digits is 576, while the sum is 26.

The square root of 18121922 is about 4256.9850833659. The cubic root of 18121922 is about 262.6645233176.

The spelling of 18121922 in words is "eighteen million, one hundred twenty-one thousand, nine hundred twenty-two".