16249987 has 4 divisors (see below), whose sum is σ = 17500000. Its totient is φ = 14999976.

The previous prime is 16249963. The next prime is 16250009. The reversal of 16249987 is 78994261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78994261 = 7691 ⋅10271.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16249987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16249927) 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, 624987 + ... + 625012.

It is an arithmetic number, because the mean of its divisors is an integer number (4375000).

Almost surely, 2^16249987 is an apocalyptic number.

16249987 is a deficient number, since it is larger than the sum of its proper divisors (1250013).

16249987 is a wasteful number, since it uses less digits than its factorization.

16249987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250012.

The product of its digits is 217728, while the sum is 46.

The square root of 16249987 is about 4031.1272616974. The cubic root of 16249987 is about 253.2897834111.

It can be divided in two parts, 1624 and 9987, that added together give a palindrome (11611).

The spelling of 16249987 in words is "sixteen million, two hundred forty-nine thousand, nine hundred eighty-seven".