18872437 has 2 divisors, whose sum is σ = 18872438. Its totient is φ = 18872436.

The previous prime is 18872429. The next prime is 18872449. The reversal of 18872437 is 73427881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11249316 + 7623121 = 3354^2 + 2761^2 .

It is a cyclic number.

It is not a de Polignac number, because 18872437 - 2³ = 18872429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18872437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18872407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9436218 + 9436219.

It is an arithmetic number, because the mean of its divisors is an integer number (9436219).

Almost surely, 2^18872437 is an apocalyptic number.

It is an amenable number.

18872437 is a deficient number, since it is larger than the sum of its proper divisors (1).

18872437 is an equidigital number, since it uses as much as digits as its factorization.

18872437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 40.

The square root of 18872437 is about 4344.2418210776. The cubic root of 18872437 is about 266.2416491757.

The spelling of 18872437 in words is "eighteen million, eight hundred seventy-two thousand, four hundred thirty-seven".