15983945 has 4 divisors (see below), whose sum is σ = 19180740. Its totient is φ = 12787152.

The previous prime is 15983939. The next prime is 15983969. The reversal of 15983945 is 54938951.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54938951 = 17 ⋅3231703.

It can be written as a sum of positive squares in 2 ways, for example, as 4748041 + 11235904 = 2179^2 + 3352^2 .

It is a cyclic number.

It is not a de Polignac number, because 15983945 - 2⁶ = 15983881 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 15983896 and 15983905.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1598390 + ... + 1598399.

It is an arithmetic number, because the mean of its divisors is an integer number (4795185).

Almost surely, 2^15983945 is an apocalyptic number.

It is an amenable number.

15983945 is a deficient number, since it is larger than the sum of its proper divisors (3196795).

15983945 is an equidigital number, since it uses as much as digits as its factorization.

15983945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3196794.

The product of its digits is 194400, while the sum is 44.

The square root of 15983945 is about 3997.9926213038. The cubic root of 15983945 is about 251.8998983036.

The spelling of 15983945 in words is "fifteen million, nine hundred eighty-three thousand, nine hundred forty-five".