19916249 has 8 divisors (see below), whose sum is σ = 20567880. Its totient is φ = 19270656.

The previous prime is 19916227. The next prime is 19916251. The reversal of 19916249 is 94261991.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5438224 + 14478025 = 2332^2 + 3805^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19916249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19916209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5747 + ... + 8535.

It is an arithmetic number, because the mean of its divisors is an integer number (2570985).

Almost surely, 2^19916249 is an apocalyptic number.

It is an amenable number.

19916249 is a deficient number, since it is larger than the sum of its proper divisors (651631).

19916249 is a wasteful number, since it uses less digits than its factorization.

19916249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3019.

The product of its digits is 34992, while the sum is 41.

The square root of 19916249 is about 4462.7624852775. The cubic root of 19916249 is about 271.0623395663.

The spelling of 19916249 in words is "nineteen million, nine hundred sixteen thousand, two hundred forty-nine".