1987618 has 8 divisors (see below), whose sum is σ = 2987712. Its totient is φ = 991716.

The previous prime is 1987577. The next prime is 1987619. The reversal of 1987618 is 8167891.

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

It is not an unprimeable number, because it can be changed into a prime (1987619) 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, 771 + ... + 2137.

It is an arithmetic number, because the mean of its divisors is an integer number (373464).

2^1987618 is an apocalyptic number.

1987618 is a deficient number, since it is larger than the sum of its proper divisors (1000094).

1987618 is a wasteful number, since it uses less digits than its factorization.

1987618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2096.

The product of its digits is 24192, while the sum is 40.

The square root of 1987618 is about 1409.8290676532. The cubic root of 1987618 is about 125.7315608639.

The spelling of 1987618 in words is "one million, nine hundred eighty-seven thousand, six hundred eighteen".