18897541 has 4 divisors (see below), whose sum is σ = 20351212. Its totient is φ = 17443872.

The previous prime is 18897517. The next prime is 18897547. The reversal of 18897541 is 14579881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14579881 = 43 ⋅339067.

It can be written as a sum of positive squares in 2 ways, for example, as 801025 + 18096516 = 895^2 + 4254^2 .

It is a cyclic number.

It is not a de Polignac number, because 18897541 - 2⁵ = 18897509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18897547) 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, 726816 + ... + 726841.

It is an arithmetic number, because the mean of its divisors is an integer number (5087803).

Almost surely, 2^18897541 is an apocalyptic number.

It is an amenable number.

18897541 is a deficient number, since it is larger than the sum of its proper divisors (1453671).

18897541 is a wasteful number, since it uses less digits than its factorization.

18897541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453670.

The product of its digits is 80640, while the sum is 43.

The square root of 18897541 is about 4347.1302027890. The cubic root of 18897541 is about 266.3596478739.

The spelling of 18897541 in words is "eighteen million, eight hundred ninety-seven thousand, five hundred forty-one".