18451970 has 16 divisors (see below), whose sum is σ = 35167608. Its totient is φ = 6946560.

The previous prime is 18451949. The next prime is 18451981. The reversal of 18451970 is 7915481.

It can be written as a sum of positive squares in 4 ways, for example, as 18309841 + 142129 = 4279^2 + 377^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18451970.

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, 54101 + ... + 54440.

Almost surely, 2^18451970 is an apocalyptic number.

18451970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18451970 is a deficient number, since it is larger than the sum of its proper divisors (16715638).

18451970 is a wasteful number, since it uses less digits than its factorization.

18451970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108565.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 18451970 is about 4295.5756308090. The cubic root of 18451970 is about 264.2495440430.

The spelling of 18451970 in words is "eighteen million, four hundred fifty-one thousand, nine hundred seventy".