15920242 has 8 divisors (see below), whose sum is σ = 25717356. Its totient is φ = 7347792.

The previous prime is 15920239. The next prime is 15920243. The reversal of 15920242 is 24202951.

It can be written as a sum of positive squares in 2 ways, for example, as 15752961 + 167281 = 3969^2 + 409^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (15920243) 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, 306133 + ... + 306184.

Almost surely, 2^15920242 is an apocalyptic number.

15920242 is a deficient number, since it is larger than the sum of its proper divisors (9797114).

15920242 is a wasteful number, since it uses less digits than its factorization.

15920242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612332.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 15920242 is about 3990.0177944465. The cubic root of 15920242 is about 251.5648090551.

The spelling of 15920242 in words is "fifteen million, nine hundred twenty thousand, two hundred forty-two".