1816477538 has 6 divisors (see below), whose sum is σ = 2724806721. Its totient is φ = 908208632.

The previous prime is 1816477513. The next prime is 1816477541. The reversal of 1816477538 is 8357746181.

It can be written as a sum of positive squares in 2 ways, for example, as 1400031889 + 416445649 = 37417^2 + 20407^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=30137.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 45206 + ... + 75342.

Almost surely, 2^1816477538 is an apocalyptic number.

1816477538 is a deficient number, since it is larger than the sum of its proper divisors (908329183).

1816477538 is an frugal number, since it uses more digits than its factorization.

1816477538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60276 (or 30139 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 50.

The square root of 1816477538 is about 42620.1541292380. The cubic root of 1816477538 is about 1220.1409713478.

Multiplying 1816477538 by its sum of digits (50), we get a square (90823876900 = 301370²).

The spelling of 1816477538 in words is "one billion, eight hundred sixteen million, four hundred seventy-seven thousand, five hundred thirty-eight".