1985770 has 16 divisors (see below), whose sum is σ = 3784968. Its totient is φ = 747520.

The previous prime is 1985759. The next prime is 1985771. The reversal of 1985770 is 775891.

It can be written as a sum of positive squares in 4 ways, for example, as 1798281 + 187489 = 1341^2 + 433^2 .

It is not an unprimeable number, because it can be changed into a prime (1985771) 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, 5671 + ... + 6010.

2^1985770 is an apocalyptic number.

1985770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1985770 is a deficient number, since it is larger than the sum of its proper divisors (1799198).

1985770 is a wasteful number, since it uses less digits than its factorization.

1985770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11705.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 1985770 is about 1409.1735166402. The cubic root of 1985770 is about 125.6925822185.

The spelling of 1985770 in words is "one million, nine hundred eighty-five thousand, seven hundred seventy".