1985997136 has 10 divisors (see below), whose sum is σ = 3847869482. Its totient is φ = 992998560.

The previous prime is 1985997121. The next prime is 1985997157. The reversal of 1985997136 is 6317995891.

It can be written as a sum of positive squares in only one way, i.e., 1392782400 + 593214736 = 37320^2 + 24356^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62062395 + ... + 62062426.

Almost surely, 2^1985997136 is an apocalyptic number.

1985997136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1985997136 is a deficient number, since it is larger than the sum of its proper divisors (1861872346).

1985997136 is a wasteful number, since it uses less digits than its factorization.

1985997136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124124829 (or 124124823 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 58.

The square root of 1985997136 is about 44564.5277771458. The cubic root of 1985997136 is about 1256.9737435148.

The spelling of 1985997136 in words is "one billion, nine hundred eighty-five million, nine hundred ninety-seven thousand, one hundred thirty-six".