1818691953 has 16 divisors (see below), whose sum is σ = 2612291136. Its totient is φ = 1118836800.

The previous prime is 1818691937. The next prime is 1818691967. The reversal of 1818691953 is 3591968181.

It is not a de Polignac number, because 1818691953 - 2⁴ = 1818691937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1818691896 and 1818691905.

It is not an unprimeable number, because it can be changed into a prime (1818691253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168351 + ... + 178827.

It is an arithmetic number, because the mean of its divisors is an integer number (163268196).

Almost surely, 2^1818691953 is an apocalyptic number.

1818691953 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1818691953 is a deficient number, since it is larger than the sum of its proper divisors (793599183).

1818691953 is a wasteful number, since it uses less digits than its factorization.

1818691953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14944.

The product of its digits is 466560, while the sum is 51.

The square root of 1818691953 is about 42646.1247125691. The cubic root of 1818691953 is about 1220.6365828120.

The spelling of 1818691953 in words is "one billion, eight hundred eighteen million, six hundred ninety-one thousand, nine hundred fifty-three".