866523440 has 40 divisors (see below), whose sum is σ = 2034633168. Its totient is φ = 343174400.

The previous prime is 866523431. The next prime is 866523499. The reversal of 866523440 is 44325668.

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

It is a junction number, because it is equal to n+sod(n) for n = 866523394 and 866523403.

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 7 ways as a sum of consecutive naturals, for example, 45542 + ... + 61701.

Almost surely, 2^866523440 is an apocalyptic number.

866523440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

866523440 is an abundant number, since it is smaller than the sum of its proper divisors (1168109728).

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

866523440 is a wasteful number, since it uses less digits than its factorization.

866523440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107357 (or 107351 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 866523440 is about 29436.7702032679. The cubic root of 866523440 is about 953.3669779097.

The spelling of 866523440 in words is "eight hundred sixty-six million, five hundred twenty-three thousand, four hundred forty".