18951442 has 16 divisors (see below), whose sum is σ = 29577240. Its totient is φ = 9096192.

The previous prime is 18951431. The next prime is 18951451. The reversal of 18951442 is 24415981.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13329801 + 5621641 = 3651^2 + 2371^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18951398 and 18951407.

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, 10348 + ... + 12040.

Almost surely, 2^18951442 is an apocalyptic number.

18951442 is a deficient number, since it is larger than the sum of its proper divisors (10625798).

18951442 is a wasteful number, since it uses less digits than its factorization.

18951442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917.

The product of its digits is 11520, while the sum is 34.

The square root of 18951442 is about 4353.3253956028. The cubic root of 18951442 is about 266.6126512123.

The spelling of 18951442 in words is "eighteen million, nine hundred fifty-one thousand, four hundred forty-two".