989743690 has 32 divisors (see below), whose sum is σ = 1965385296. Its totient is φ = 356528640.

The previous prime is 989743627. The next prime is 989743717. The reversal of 989743690 is 96347989.

It can be written as a sum of positive squares in 8 ways, for example, as 223173721 + 766569969 = 14939^2 + 27687^2 .

It is a super-2 number, since 2×989743690² = 1959185143789632200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87517 + ... + 98176.

Almost surely, 2^989743690 is an apocalyptic number.

989743690 is a deficient number, since it is larger than the sum of its proper divisors (975641606).

989743690 is a wasteful number, since it uses less digits than its factorization.

989743690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185754.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 989743690 is about 31460.1921481735. The cubic root of 989743690 is about 996.5694749553.

The spelling of 989743690 in words is "nine hundred eighty-nine million, seven hundred forty-three thousand, six hundred ninety".