1811472939 has 48 divisors (see below), whose sum is σ = 2888121600. Its totient is φ = 1088987328.

The previous prime is 1811472917. The next prime is 1811472979. The reversal of 1811472939 is 9392741181.

It is not a de Polignac number, because 1811472939 - 2¹² = 1811468843 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1811472894 and 1811472903.

It is not an unprimeable number, because it can be changed into a prime (1811472979) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 891777 + ... + 893805.

It is an arithmetic number, because the mean of its divisors is an integer number (60169200).

Almost surely, 2^1811472939 is an apocalyptic number.

1811472939 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1811472939 is a deficient number, since it is larger than the sum of its proper divisors (1076648661).

1811472939 is a wasteful number, since it uses less digits than its factorization.

1811472939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2304 (or 2301 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1811472939 is about 42561.4019858369. The cubic root of 1811472939 is about 1219.0193990340.

The spelling of 1811472939 in words is "one billion, eight hundred eleven million, four hundred seventy-two thousand, nine hundred thirty-nine".