3181987 has 8 divisors (see below), whose sum is σ = 3368960. Its totient is φ = 2997000.

The previous prime is 3181973. The next prime is 3181999. The reversal of 3181987 is 7891813.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3181987 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (3188987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3862 + ... + 4612.

It is an arithmetic number, because the mean of its divisors is an integer number (421120).

Almost surely, 2^3181987 is an apocalyptic number.

3181987 is a deficient number, since it is larger than the sum of its proper divisors (186973).

3181987 is a wasteful number, since it uses less digits than its factorization.

3181987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993.

The product of its digits is 12096, while the sum is 37.

The square root of 3181987 is about 1783.8124901458. The cubic root of 3181987 is about 147.0842375874.

The spelling of 3181987 in words is "three million, one hundred eighty-one thousand, nine hundred eighty-seven".