861378 has 16 divisors (see below), whose sum is σ = 1968960. Its totient is φ = 246096.

The previous prime is 861361. The next prime is 861391. The reversal of 861378 is 873168.

It is an unprimeable number.

861378 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10213 + ... + 10296.

It is an arithmetic number, because the mean of its divisors is an integer number (123060).

2⁸⁶¹³⁷⁸ is an apocalyptic number.

861378 is an abundant number, since it is smaller than the sum of its proper divisors (1107582).

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

861378 is a wasteful number, since it uses less digits than its factorization.

861378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20521.

The product of its digits is 8064, while the sum is 33.

The square root of 861378 is about 928.1045199761. The cubic root of 861378 is about 95.1476190669.

The spelling of 861378 in words is "eight hundred sixty-one thousand, three hundred seventy-eight".