18951445 has 4 divisors (see below), whose sum is σ = 22741740. Its totient is φ = 15161152.

The previous prime is 18951431. The next prime is 18951451. The reversal of 18951445 is 54415981.

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 4866436 + 14085009 = 2206^2 + 3753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18951445 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1895140 + ... + 1895149.

It is an arithmetic number, because the mean of its divisors is an integer number (5685435).

Almost surely, 2^18951445 is an apocalyptic number.

It is an amenable number.

18951445 is a deficient number, since it is larger than the sum of its proper divisors (3790295).

18951445 is an equidigital number, since it uses as much as digits as its factorization.

18951445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3790294.

The product of its digits is 28800, while the sum is 37.

The square root of 18951445 is about 4353.3257401669. The cubic root of 18951445 is about 266.6126652805.

The spelling of 18951445 in words is "eighteen million, nine hundred fifty-one thousand, four hundred forty-five".