2190743906 has 8 divisors (see below), whose sum is σ = 3538894044. Its totient is φ = 1011112560.

The previous prime is 2190743903. The next prime is 2190743917. The reversal of 2190743906 is 6093470912.

It can be written as a sum of positive squares in 2 ways, for example, as 2153424025 + 37319881 = 46405^2 + 6109^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2190743906² = 9598717723352273672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2190743903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42129665 + ... + 42129716.

Almost surely, 2^2190743906 is an apocalyptic number.

2190743906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2190743906 is a deficient number, since it is larger than the sum of its proper divisors (1348150138).

2190743906 is a wasteful number, since it uses less digits than its factorization.

2190743906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84259396.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 2190743906 is about 46805.3833014964. The cubic root of 2190743906 is about 1298.7648833102.

The spelling of 2190743906 in words is "two billion, one hundred ninety million, seven hundred forty-three thousand, nine hundred six".