2012656440 has 64 divisors (see below), whose sum is σ = 6201171360. Its totient is φ = 522201600.

The previous prime is 2012656433. The next prime is 2012656511. The reversal of 2012656440 is 446562102.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2012656398 and 2012656407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222211 + ... + 231090.

Almost surely, 2^2012656440 is an apocalyptic number.

2012656440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2012656440 is an abundant number, since it is smaller than the sum of its proper divisors (4188514920).

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

2012656440 is a wasteful number, since it uses less digits than its factorization.

2012656440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453352 (or 453348 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 2012656440 is about 44862.6396905042. The cubic root of 2012656440 is about 1262.5731492433.

The spelling of 2012656440 in words is "two billion, twelve million, six hundred fifty-six thousand, four hundred forty".