840111012 has 36 divisors (see below), whose sum is σ = 2286970140. Its totient is φ = 258495552.

The previous prime is 840111001. The next prime is 840111023. The reversal of 840111012 is 210111048.

It is an interprime number because it is at equal distance from previous prime (840111001) and next prime (840111023).

It can be written as a sum of positive squares in 2 ways, for example, as 274432356 + 565678656 = 16566^2 + 23784^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 897087 + ... + 898022.

Almost surely, 2^840111012 is an apocalyptic number.

It is an amenable number.

840111012 is an abundant number, since it is smaller than the sum of its proper divisors (1446859128).

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

840111012 is a wasteful number, since it uses less digits than its factorization.

840111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795132 (or 1795127 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 840111012 is about 28984.6685680551. The cubic root of 840111012 is about 943.5803593629.

The spelling of 840111012 in words is "eight hundred forty million, one hundred eleven thousand, twelve".