16387493 has 2 divisors, whose sum is σ = 16387494. Its totient is φ = 16387492.

The previous prime is 16387489. The next prime is 16387517. The reversal of 16387493 is 39478361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16337764 + 49729 = 4042^2 + 223^2 .

It is a cyclic number.

It is not a de Polignac number, because 16387493 - 2² = 16387489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16387493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16387433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8193746 + 8193747.

It is an arithmetic number, because the mean of its divisors is an integer number (8193747).

Almost surely, 2^16387493 is an apocalyptic number.

It is an amenable number.

16387493 is a deficient number, since it is larger than the sum of its proper divisors (1).

16387493 is an equidigital number, since it uses as much as digits as its factorization.

16387493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 16387493 is about 4048.1468599842. The cubic root of 16387493 is about 254.0022164851.

The spelling of 16387493 in words is "sixteen million, three hundred eighty-seven thousand, four hundred ninety-three".