1918408956 has 12 divisors (see below), whose sum is σ = 4476287592. Its totient is φ = 639469648.

The previous prime is 1918408939. The next prime is 1918408981. The reversal of 1918408956 is 6598048191.

1918408956 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1918408956² = 7360585844922019872, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1918408899 and 1918408908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79933695 + ... + 79933718.

It is an arithmetic number, because the mean of its divisors is an integer number (373023966).

Almost surely, 2^1918408956 is an apocalyptic number.

It is an amenable number.

1918408956 is an abundant number, since it is smaller than the sum of its proper divisors (2557878636).

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

1918408956 is a wasteful number, since it uses less digits than its factorization.

1918408956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159867420 (or 159867418 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 51.

The square root of 1918408956 is about 43799.6456150047. The cubic root of 1918408956 is about 1242.5495919760.

The spelling of 1918408956 in words is "one billion, nine hundred eighteen million, four hundred eight thousand, nine hundred fifty-six".