18797421 has 8 divisors (see below), whose sum is σ = 25087744. Its totient is φ = 12519360.

The previous prime is 18797411. The next prime is 18797431. The reversal of 18797421 is 12479781.

It is an interprime number because it is at equal distance from previous prime (18797411) and next prime (18797431).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18797421 - 2⁷ = 18797293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18797421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18797411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1476 + ... + 6306.

It is an arithmetic number, because the mean of its divisors is an integer number (3135968).

Almost surely, 2^18797421 is an apocalyptic number.

It is an amenable number.

18797421 is a deficient number, since it is larger than the sum of its proper divisors (6290323).

18797421 is a wasteful number, since it uses less digits than its factorization.

18797421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6131.

The product of its digits is 28224, while the sum is 39.

The square root of 18797421 is about 4335.5992665374. The cubic root of 18797421 is about 265.8884196683. Note that the first 3 decimals are identical.

The spelling of 18797421 in words is "eighteen million, seven hundred ninety-seven thousand, four hundred twenty-one".