1918422765 has 48 divisors (see below), whose sum is σ = 3967364160. Its totient is φ = 876990240.

The previous prime is 1918422763. The next prime is 1918422791. The reversal of 1918422765 is 5672248191.

It is not a de Polignac number, because 1918422765 - 2¹ = 1918422763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1918422765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918422763) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 138391 + ... + 151620.

It is an arithmetic number, because the mean of its divisors is an integer number (82653420).

Almost surely, 2^1918422765 is an apocalyptic number.

1918422765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1918422765 is an abundant number, since it is smaller than the sum of its proper divisors (2048941395).

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

1918422765 is a wasteful number, since it uses less digits than its factorization.

1918422765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290039 (or 290026 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 1918422765 is about 43799.8032529828. The cubic root of 1918422765 is about 1242.5525733226.

The spelling of 1918422765 in words is "one billion, nine hundred eighteen million, four hundred twenty-two thousand, seven hundred sixty-five".