18954869 has 4 divisors (see below), whose sum is σ = 19002540. Its totient is φ = 18907200.

The previous prime is 18954853. The next prime is 18954883. The reversal of 18954869 is 96845981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9579025 + 9375844 = 3095^2 + 3062^2 .

It is a cyclic number.

It is not a de Polignac number, because 18954869 - 2⁴ = 18954853 is a prime.

It is a super-2 number, since 2×18954869² = 718574117614322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18954839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23234 + ... + 24035.

It is an arithmetic number, because the mean of its divisors is an integer number (4750635).

Almost surely, 2^18954869 is an apocalyptic number.

It is an amenable number.

18954869 is a deficient number, since it is larger than the sum of its proper divisors (47671).

18954869 is an equidigital number, since it uses as much as digits as its factorization.

18954869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47670.

The product of its digits is 622080, while the sum is 50.

The square root of 18954869 is about 4353.7189849599. The cubic root of 18954869 is about 266.6287208160.

The spelling of 18954869 in words is "eighteen million, nine hundred fifty-four thousand, eight hundred sixty-nine".