1918794450 has 48 divisors (see below), whose sum is σ = 4775649696. Its totient is φ = 509846400.

The previous prime is 1918794443. The next prime is 1918794469. The reversal of 1918794450 is 544978191.

It is a self number, because there is not a number n which added to its sum of digits gives 1918794450.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19389 + ... + 64911.

It is an arithmetic number, because the mean of its divisors is an integer number (99492702).

Almost surely, 2^1918794450 is an apocalyptic number.

1918794450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1918794450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2387824848).

1918794450 is an abundant number, since it is smaller than the sum of its proper divisors (2856855246).

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

1918794450 is a wasteful number, since it uses less digits than its factorization.

1918794450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45819 (or 45814 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 1918794450 is about 43804.0460459990. The cubic root of 1918794450 is about 1242.6328142960.

The spelling of 1918794450 in words is "one billion, nine hundred eighteen million, seven hundred ninety-four thousand, four hundred fifty".