1987730 has 16 divisors (see below), whose sum is σ = 3599640. Its totient is φ = 790272.

The previous prime is 1987709. The next prime is 1987789. The reversal of 1987730 is 377891.

It can be written as a sum of positive squares in 4 ways, for example, as 1874161 + 113569 = 1369^2 + 337^2 .

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, 1466 + ... + 2474.

2^1987730 is an apocalyptic number.

1987730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1987730 is a deficient number, since it is larger than the sum of its proper divisors (1611910).

1987730 is a wasteful number, since it uses less digits than its factorization.

1987730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 1987730 is about 1409.8687882211. The cubic root of 1987730 is about 125.7339224294.

The spelling of 1987730 in words is "one million, nine hundred eighty-seven thousand, seven hundred thirty".