1984435690 has 12 divisors (see below), whose sum is σ = 3572237826. Its totient is φ = 793717928.

The previous prime is 1984435669. The next prime is 1984435697. The reversal of 1984435690 is 965344891.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1785992121 + 198443569 = 42261^2 + 14087^2 .

It is a super-2 number, since 2×1984435690² = 7875970015491552200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1984435697) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 133827 + ... + 147913.

Almost surely, 2^1984435690 is an apocalyptic number.

1984435690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1984435690 is a deficient number, since it is larger than the sum of its proper divisors (1587802136).

1984435690 is an frugal number, since it uses more digits than its factorization.

1984435690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28181 (or 14094 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 1984435690 is about 44547.0053987920. The cubic root of 1984435690 is about 1256.6442346099.

The spelling of 1984435690 in words is "one billion, nine hundred eighty-four million, four hundred thirty-five thousand, six hundred ninety".