1813826450 has 54 divisors (see below), whose sum is σ = 3571894431. Its totient is φ = 685176480.

The previous prime is 1813826449. The next prime is 1813826459. The reversal of 1813826450 is 546283181.

It can be written as a sum of positive squares in 5 ways, for example, as 16999129 + 1796827321 = 4123^2 + 42389^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=30115.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1813826459) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5721692 + ... + 5722008.

Almost surely, 2^1813826450 is an apocalyptic number.

1813826450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1813826450 is a deficient number, since it is larger than the sum of its proper divisors (1758067981).

1813826450 is an equidigital number, since it uses as much as digits as its factorization.

1813826450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 1813826450 is about 42589.0414308658. The cubic root of 1813826450 is about 1219.5470974091.

The spelling of 1813826450 in words is "one billion, eight hundred thirteen million, eight hundred twenty-six thousand, four hundred fifty".