861214380 has 96 divisors (see below), whose sum is σ = 2633637888. Its totient is φ = 208992000.

The previous prime is 861214357. The next prime is 861214381. The reversal of 861214380 is 83412168.

861214380 = 2826² + 2827² + ... + 2929².

861214380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (861214381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47605 + ... + 63155.

It is an arithmetic number, because the mean of its divisors is an integer number (27433728).

Almost surely, 2^861214380 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 861214380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1316818944).

861214380 is an abundant number, since it is smaller than the sum of its proper divisors (1772423508).

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

861214380 is a wasteful number, since it uses less digits than its factorization.

861214380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15647 (or 15645 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 861214380 is about 29346.4543003069. The cubic root of 861214380 is about 951.4159420938.

The spelling of 861214380 in words is "eight hundred sixty-one million, two hundred fourteen thousand, three hundred eighty".