1987870 has 16 divisors (see below), whose sum is σ = 3606768. Its totient is φ = 788800.

The previous prime is 1987849. The next prime is 1987873. The reversal of 1987870 is 787891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987873) 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, 645 + ... + 2095.

It is an arithmetic number, because the mean of its divisors is an integer number (225423).

2^1987870 is an apocalyptic number.

1987870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1987870 is a deficient number, since it is larger than the sum of its proper divisors (1618898).

1987870 is a wasteful number, since it uses less digits than its factorization.

1987870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 1987870 is about 1409.9184373573. The cubic root of 1987870 is about 125.7368742616.

The spelling of 1987870 in words is "one million, nine hundred eighty-seven thousand, eight hundred seventy".