16249881 has 8 divisors (see below), whose sum is σ = 21700224. Its totient is φ = 10816400.

The previous prime is 16249867. The next prime is 16249897. The reversal of 16249881 is 18894261.

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

It is a cyclic number.

It is not a de Polignac number, because 16249881 - 2²² = 12055577 is a prime.

It is a super-2 number, since 2×16249881² = 528117265028322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16249801) 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, 1761 + ... + 5966.

It is an arithmetic number, because the mean of its divisors is an integer number (2712528).

Almost surely, 2^16249881 is an apocalyptic number.

It is an amenable number.

16249881 is a deficient number, since it is larger than the sum of its proper divisors (5450343).

16249881 is an equidigital number, since it uses as much as digits as its factorization.

16249881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8431.

The product of its digits is 27648, while the sum is 39.

The square root of 16249881 is about 4031.1141139888. The cubic root of 16249881 is about 253.2892326665.

The spelling of 16249881 in words is "sixteen million, two hundred forty-nine thousand, eight hundred eighty-one".