18742351 has 2 divisors, whose sum is σ = 18742352. Its totient is φ = 18742350.

The previous prime is 18742349. The next prime is 18742357. The reversal of 18742351 is 15324781.

It is a weak prime.

It is an emirp because it is prime and its reverse (15324781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18742351 - 2¹ = 18742349 is a prime.

Together with 18742349, it forms a pair of twin primes.

It is equal to p_1195690 and since 18742351 and 1195690 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18742357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9371175 + 9371176.

It is an arithmetic number, because the mean of its divisors is an integer number (9371176).

Almost surely, 2^18742351 is an apocalyptic number.

18742351 is a deficient number, since it is larger than the sum of its proper divisors (1).

18742351 is an equidigital number, since it uses as much as digits as its factorization.

18742351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 31.

The square root of 18742351 is about 4329.2436983843. The cubic root of 18742351 is about 265.6285117137.

It can be divided in two parts, 1874 and 2351, that added together give a square (4225 = 65²).

The spelling of 18742351 in words is "eighteen million, seven hundred forty-two thousand, three hundred fifty-one".