1817951916 has 144 divisors (see below), whose sum is σ = 5045096448. Its totient is φ = 507133440.

The previous prime is 1817951909. The next prime is 1817951917. The reversal of 1817951916 is 6191597181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1817951917) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 1159365 + ... + 1160931.

It is an arithmetic number, because the mean of its divisors is an integer number (35035392).

Almost surely, 2^1817951916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1817951916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2522548224).

1817951916 is an abundant number, since it is smaller than the sum of its proper divisors (3227144532).

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

1817951916 is a wasteful number, since it uses less digits than its factorization.

1817951916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660 (or 1647 counting only the distinct ones).

The product of its digits is 136080, while the sum is 48.

The square root of 1817951916 is about 42637.4473438549. The cubic root of 1817951916 is about 1220.4709988268.

The spelling of 1817951916 in words is "one billion, eight hundred seventeen million, nine hundred fifty-one thousand, nine hundred sixteen".