15871855 has 4 divisors (see below), whose sum is σ = 19046232. Its totient is φ = 12697480.

The previous prime is 15871789. The next prime is 15871871. The reversal of 15871855 is 55817851.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 15871855 - 2¹³ = 15863663 is a prime.

It is a super-2 number, since 2×15871855² = 503831562282050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1587181 + ... + 1587190.

It is an arithmetic number, because the mean of its divisors is an integer number (4761558).

Almost surely, 2^15871855 is an apocalyptic number.

15871855 is a deficient number, since it is larger than the sum of its proper divisors (3174377).

15871855 is an equidigital number, since it uses as much as digits as its factorization.

15871855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174376.

The product of its digits is 56000, while the sum is 40.

The square root of 15871855 is about 3983.9496733769. The cubic root of 15871855 is about 251.3096868997.

The spelling of 15871855 in words is "fifteen million, eight hundred seventy-one thousand, eight hundred fifty-five".