1987634 has 16 divisors (see below), whose sum is σ = 3278016. Its totient is φ = 896400.

The previous prime is 1987621. The next prime is 1987649. The reversal of 1987634 is 4367891.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3404 + ... + 3944.

It is an arithmetic number, because the mean of its divisors is an integer number (204876).

2^1987634 is an apocalyptic number.

1987634 is a deficient number, since it is larger than the sum of its proper divisors (1290382).

1987634 is a wasteful number, since it uses less digits than its factorization.

1987634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721.

The product of its digits is 36288, while the sum is 38.

The square root of 1987634 is about 1409.8347420886. The cubic root of 1987634 is about 125.7318982358.

The spelling of 1987634 in words is "one million, nine hundred eighty-seven thousand, six hundred thirty-four".