866273940 has 240 divisors, whose sum is σ = 3171168000. Its totient is φ = 197878464.

The previous prime is 866273929. The next prime is 866273957. The reversal of 866273940 is 49372668.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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 79 ways as a sum of consecutive naturals, for example, 554881 + ... + 556439.

It is an arithmetic number, because the mean of its divisors is an integer number (13213200).

Almost surely, 2^866273940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866273940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1585584000).

866273940 is an abundant number, since it is smaller than the sum of its proper divisors (2304894060).

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

866273940 is a wasteful number, since it uses less digits than its factorization.

866273940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601 (or 1576 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 866273940 is about 29432.5320011718. The cubic root of 866273940 is about 953.2754674425.

The spelling of 866273940 in words is "eight hundred sixty-six million, two hundred seventy-three thousand, nine hundred forty".