836991421440 has 176 divisors, whose sum is σ = 2681563449600. Its totient is φ = 222822645760.

The previous prime is 836991421403. The next prime is 836991421547. The reversal of 836991421440 is 44124199638.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9155155 + ... + 9246125.

Almost surely, 2^836991421440 is an apocalyptic number.

836991421440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 836991421440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1340781724800).

836991421440 is an abundant number, since it is smaller than the sum of its proper divisors (1844572028160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

836991421440 is a wasteful number, since it uses less digits than its factorization.

836991421440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91598 (or 91580 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 51.

The spelling of 836991421440 in words is "eight hundred thirty-six billion, nine hundred ninety-one million, four hundred twenty-one thousand, four hundred forty".