971778 has 16 divisors (see below), whose sum is σ = 1958400. Its totient is φ = 321456.

The previous prime is 971767. The next prime is 971783. The reversal of 971778 is 877179.

It is a happy number.

It is an unprimeable number.

971778 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, 351 + ... + 1437.

It is an arithmetic number, because the mean of its divisors is an integer number (122400).

2⁹⁷¹⁷⁷⁸ is an apocalyptic number.

971778 is an abundant number, since it is smaller than the sum of its proper divisors (986622).

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

971778 is a wasteful number, since it uses less digits than its factorization.

971778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241.

The product of its digits is 24696, while the sum is 39.

The square root of 971778 is about 985.7880096654. The cubic root of 971778 is about 99.0502754538.

The spelling of 971778 in words is "nine hundred seventy-one thousand, seven hundred seventy-eight".