15985949 has 4 divisors (see below), whose sum is σ = 18269664. Its totient is φ = 13702236.

The previous prime is 15985919. The next prime is 15985979. The reversal of 15985949 is 94958951.

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 an interprime number because it is at equal distance from previous prime (15985919) and next prime (15985979).

It is a cyclic number.

It is not a de Polignac number, because 15985949 - 2¹⁶ = 15920413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15985897 and 15985906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15985919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1141847 + ... + 1141860.

It is an arithmetic number, because the mean of its divisors is an integer number (4567416).

Almost surely, 2^15985949 is an apocalyptic number.

It is an amenable number.

15985949 is a deficient number, since it is larger than the sum of its proper divisors (2283715).

15985949 is an equidigital number, since it uses as much as digits as its factorization.

15985949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283714.

The product of its digits is 583200, while the sum is 50.

The square root of 15985949 is about 3998.2432392239. The cubic root of 15985949 is about 251.9104252480.

The spelling of 15985949 in words is "fifteen million, nine hundred eighty-five thousand, nine hundred forty-nine".