1491887 has 4 divisors (see below), whose sum is σ = 1502760. Its totient is φ = 1481016.

The previous prime is 1491863. The next prime is 1491911. The reversal of 1491887 is 7881941.

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

It is an interprime number because it is at equal distance from previous prime (1491863) and next prime (1491911).

It is a cyclic number.

It is not a de Polignac number, because 1491887 - 2¹⁴ = 1475503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1491887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491587) 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 in 3 ways as a sum of consecutive naturals, for example, 5228 + ... + 5505.

It is an arithmetic number, because the mean of its divisors is an integer number (375690).

2^1491887 is an apocalyptic number.

1491887 is a deficient number, since it is larger than the sum of its proper divisors (10873).

1491887 is a wasteful number, since it uses less digits than its factorization.

1491887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10872.

The product of its digits is 16128, while the sum is 38.

The square root of 1491887 is about 1221.4282623224. The cubic root of 1491887 is about 114.2646717955.

The spelling of 1491887 in words is "one million, four hundred ninety-one thousand, eight hundred eighty-seven".