1918260990 has 24 divisors (see below), whose sum is σ = 4987478808. Its totient is φ = 511536240.

The previous prime is 1918260937. The next prime is 1918261013. The reversal of 1918260990 is 990628191.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10656916 + ... + 10657095.

It is an arithmetic number, because the mean of its divisors is an integer number (207811617).

Almost surely, 2^1918260990 is an apocalyptic number.

1918260990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1918260990 is an abundant number, since it is smaller than the sum of its proper divisors (3069217818).

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

1918260990 is a wasteful number, since it uses less digits than its factorization.

1918260990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21314024 (or 21314021 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 1918260990 is about 43797.9564591774. The cubic root of 1918260990 is about 1242.5176453952.

The spelling of 1918260990 in words is "one billion, nine hundred eighteen million, two hundred sixty thousand, nine hundred ninety".