15145993 has 4 divisors (see below), whose sum is σ = 15163600. Its totient is φ = 15128388.

The previous prime is 15145981. The next prime is 15146003. The reversal of 15145993 is 39954151.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15145993 is a prime.

It is a super-2 number, since 2×15145993² = 458802207912098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15145973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7443 + ... + 9256.

It is an arithmetic number, because the mean of its divisors is an integer number (3790900).

Almost surely, 2^15145993 is an apocalyptic number.

It is an amenable number.

15145993 is a deficient number, since it is larger than the sum of its proper divisors (17607).

15145993 is an equidigital number, since it uses as much as digits as its factorization.

15145993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17606.

The product of its digits is 24300, while the sum is 37.

The square root of 15145993 is about 3891.7853229591. The cubic root of 15145993 is about 247.4187360321.

The spelling of 15145993 in words is "fifteen million, one hundred forty-five thousand, nine hundred ninety-three".