7172987 has 4 divisors (see below), whose sum is σ = 7484880. Its totient is φ = 6861096.

The previous prime is 7172969. The next prime is 7172989. The reversal of 7172987 is 7892717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7892717 = 7 ⋅1127531.

It is a cyclic number.

It is not a de Polignac number, because 7172987 - 2⁶ = 7172923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7172989) 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, 155912 + ... + 155957.

It is an arithmetic number, because the mean of its divisors is an integer number (1871220).

Almost surely, 2^7172987 is an apocalyptic number.

7172987 is a deficient number, since it is larger than the sum of its proper divisors (311893).

7172987 is a wasteful number, since it uses less digits than its factorization.

7172987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311892.

The product of its digits is 49392, while the sum is 41.

The square root of 7172987 is about 2678.2432675170. The cubic root of 7172987 is about 192.8560857216.

The spelling of 7172987 in words is "seven million, one hundred seventy-two thousand, nine hundred eighty-seven".