15997845 has 8 divisors (see below), whose sum is σ = 25596576. Its totient is φ = 8532176.

The previous prime is 15997841. The next prime is 15997853. The reversal of 15997845 is 54879951.

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 15997845 - 2² = 15997841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15997794 and 15997803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15997841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533247 + ... + 533276.

It is an arithmetic number, because the mean of its divisors is an integer number (3199572).

Almost surely, 2^15997845 is an apocalyptic number.

15997845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15997845 is a deficient number, since it is larger than the sum of its proper divisors (9598731).

15997845 is a wasteful number, since it uses less digits than its factorization.

15997845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066531.

The product of its digits is 453600, while the sum is 48.

The square root of 15997845 is about 3999.7306159290. The cubic root of 15997845 is about 251.9728964299.

The spelling of 15997845 in words is "fifteen million, nine hundred ninety-seven thousand, eight hundred forty-five".