836997981 has 8 divisors (see below), whose sum is σ = 1117172160. Its totient is φ = 557411232.

The previous prime is 836997901. The next prime is 836998007. The reversal of 836997981 is 189799638.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 836997981 - 2¹³ = 836989789 is a prime.

It is a super-2 number, since 2×836997981² = 1401131240396152722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (836997901) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 143521 + ... + 149238.

It is an arithmetic number, because the mean of its divisors is an integer number (139646520).

Almost surely, 2^836997981 is an apocalyptic number.

It is an amenable number.

836997981 is a deficient number, since it is larger than the sum of its proper divisors (280174179).

836997981 is a wasteful number, since it uses less digits than its factorization.

836997981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293715.

The product of its digits is 5878656, while the sum is 60.

The square root of 836997981 is about 28930.9173895333. The cubic root of 836997981 is about 942.4134379572.

The spelling of 836997981 in words is "eight hundred thirty-six million, nine hundred ninety-seven thousand, nine hundred eighty-one".