18248227397 has 8 divisors (see below), whose sum is σ = 19792913112. Its totient is φ = 16755904000.

The previous prime is 18248227357. The next prime is 18248227421. The reversal of 18248227397 is 79372284281.

It is a Cunningham number, because it is equal to 135086²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 18248227396 = 1^2 + 135086^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18248227397 - 2²⁰ = 18247178821 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 (18248227357) 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, 13089854 + ... + 13091247.

It is an arithmetic number, because the mean of its divisors is an integer number (2474114139).

Almost surely, 2^18248227397 is an apocalyptic number.

18248227397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18248227397 is a deficient number, since it is larger than the sum of its proper divisors (1544685715).

18248227397 is a wasteful number, since it uses less digits than its factorization.

18248227397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26181159.

The product of its digits is 2709504, while the sum is 53.

The spelling of 18248227397 in words is "eighteen billion, two hundred forty-eight million, two hundred twenty-seven thousand, three hundred ninety-seven".