15940087 has 4 divisors (see below), whose sum is σ = 16056576. Its totient is φ = 15823600.

The previous prime is 15940073. The next prime is 15940091. The reversal of 15940087 is 78004951.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78004951 = 67 ⋅1164253.

It is a cyclic number.

It is not a de Polignac number, because 15940087 - 2¹⁵ = 15907319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15940027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58039 + ... + 58312.

It is an arithmetic number, because the mean of its divisors is an integer number (4014144).

Almost surely, 2^15940087 is an apocalyptic number.

15940087 is a deficient number, since it is larger than the sum of its proper divisors (116489).

15940087 is a wasteful number, since it uses less digits than its factorization.

15940087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116488.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 15940087 is about 3992.5038509687. The cubic root of 15940087 is about 251.6692930348.

The spelling of 15940087 in words is "fifteen million, nine hundred forty thousand, eighty-seven".