1918945210 has 128 divisors (see below), whose sum is σ = 4534838784. Its totient is φ = 567336960.

The previous prime is 1918945207. The next prime is 1918945211. The reversal of 1918945210 is 125498191.

It is not an unprimeable number, because it can be changed into a prime (1918945211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2521230 + ... + 2521990.

It is an arithmetic number, because the mean of its divisors is an integer number (35428428).

Almost surely, 2^1918945210 is an apocalyptic number.

1918945210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1918945210 is an abundant number, since it is smaller than the sum of its proper divisors (2615893574).

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

1918945210 is a wasteful number, since it uses less digits than its factorization.

1918945210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 1918945210 is about 43805.7668578008. The cubic root of 1918945210 is about 1242.6653580662.

The spelling of 1918945210 in words is "one billion, nine hundred eighteen million, nine hundred forty-five thousand, two hundred ten".