861963 has 4 divisors (see below), whose sum is σ = 1149288. Its totient is φ = 574640.

The previous prime is 861947. The next prime is 861977. The reversal of 861963 is 369168.

861963 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 861963 - 2⁴ = 861947 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (861163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143658 + ... + 143663.

It is an arithmetic number, because the mean of its divisors is an integer number (287322).

2⁸⁶¹⁹⁶³ is an apocalyptic number.

861963 is a deficient number, since it is larger than the sum of its proper divisors (287325).

861963 is a wasteful number, since it uses less digits than its factorization.

861963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287324.

The product of its digits is 7776, while the sum is 33.

The square root of 861963 is about 928.4196249541. The cubic root of 861963 is about 95.1691538485.

The spelling of 861963 in words is "eight hundred sixty-one thousand, nine hundred sixty-three".