1817649738 has 12 divisors (see below), whose sum is σ = 3938241138. Its totient is φ = 605883240.

The previous prime is 1817649709. The next prime is 1817649749. The reversal of 1817649738 is 8379467181.

1817649738 is a `hidden beast` number, since 1 + 81 + 76 + 497 + 3 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1815015609 + 2634129 = 42603^2 + 1623^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50490253 + ... + 50490288.

Almost surely, 2^1817649738 is an apocalyptic number.

1817649738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1817649738 is an abundant number, since it is smaller than the sum of its proper divisors (2120591400).

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

1817649738 is a wasteful number, since it uses less digits than its factorization.

1817649738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100980549 (or 100980546 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 1817649738 is about 42633.9036214138. The cubic root of 1817649738 is about 1220.4033732903.

The spelling of 1817649738 in words is "one billion, eight hundred seventeen million, six hundred forty-nine thousand, seven hundred thirty-eight".