1984784690 has 24 divisors (see below), whose sum is σ = 4155897132. Its totient is φ = 680497440.

The previous prime is 1984784689. The next prime is 1984784699. The reversal of 1984784690 is 964874891.

It can be written as a sum of positive squares in 2 ways, for example, as 1809566521 + 175218169 = 42539^2 + 13237^2 .

It is a super-2 number, since 2×1984784690² = 7878740531316792200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1984784699) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2024801 + ... + 2025780.

Almost surely, 2^1984784690 is an apocalyptic number.

1984784690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1984784690 is an abundant number, since it is smaller than the sum of its proper divisors (2171112442).

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

1984784690 is a wasteful number, since it uses less digits than its factorization.

1984784690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050602 (or 4050595 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 56.

The square root of 1984784690 is about 44550.9224371393. The cubic root of 1984784690 is about 1256.7178983946.

The spelling of 1984784690 in words is "one billion, nine hundred eighty-four million, seven hundred eighty-four thousand, six hundred ninety".