811379440 has 40 divisors (see below), whose sum is σ = 1891584288. Its totient is φ = 323669760.

The previous prime is 811379431. The next prime is 811379467. The reversal of 811379440 is 44973118.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 811379440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16245 + ... + 43435.

Almost surely, 2^811379440 is an apocalyptic number.

811379440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

811379440 is an abundant number, since it is smaller than the sum of its proper divisors (1080204848).

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

811379440 is a wasteful number, since it uses less digits than its factorization.

811379440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27577 (or 27571 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 811379440 is about 28484.7229229986. The cubic root of 811379440 is about 932.6986172101.

The spelling of 811379440 in words is "eight hundred eleven million, three hundred seventy-nine thousand, four hundred forty".