15993641 has 4 divisors (see below), whose sum is σ = 16060800. Its totient is φ = 15926484.

The previous prime is 15993631. The next prime is 15993647. The reversal of 15993641 is 14639951.

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-15993641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15993595 and 15993604.

It is not an unprimeable number, because it can be changed into a prime (15993647) 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, 33221 + ... + 33698.

It is an arithmetic number, because the mean of its divisors is an integer number (4015200).

Almost surely, 2^15993641 is an apocalyptic number.

It is an amenable number.

15993641 is a deficient number, since it is larger than the sum of its proper divisors (67159).

15993641 is an equidigital number, since it uses as much as digits as its factorization.

15993641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67158.

The product of its digits is 29160, while the sum is 38.

The square root of 15993641 is about 3999.2050460060. The cubic root of 15993641 is about 251.9508228973.

The spelling of 15993641 in words is "fifteen million, nine hundred ninety-three thousand, six hundred forty-one".