840125684 has 12 divisors (see below), whose sum is σ = 1497960324. Its totient is φ = 412137024.

The previous prime is 840125681. The next prime is 840125687. The reversal of 840125684 is 486521048.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (840125681) and next prime (840125687).

It can be written as a sum of positive squares in 2 ways, for example, as 314707600 + 525418084 = 17740^2 + 22922^2 .

It is a super-2 number, since 2×840125684² = 1411622329832935712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840125681) 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, 1981217 + ... + 1981640.

It is an arithmetic number, because the mean of its divisors is an integer number (124830027).

Almost surely, 2^840125684 is an apocalyptic number.

It is an amenable number.

840125684 is a deficient number, since it is larger than the sum of its proper divisors (657834640).

840125684 is a wasteful number, since it uses less digits than its factorization.

840125684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3962914 (or 3962912 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 840125684 is about 28984.9216662733. The cubic root of 840125684 is about 943.5858523395.

The spelling of 840125684 in words is "eight hundred forty million, one hundred twenty-five thousand, six hundred eighty-four".