220835749 has 4 divisors (see below), whose sum is σ = 221260140. Its totient is φ = 220411360.

The previous prime is 220835737. The next prime is 220835753. The reversal of 220835749 is 947538022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 947538022 = 2 ⋅473769011.

It can be written as a sum of positive squares in 2 ways, for example, as 158583649 + 62252100 = 12593^2 + 7890^2 .

It is a cyclic number.

It is not a de Polignac number, because 220835749 - 2¹⁷ = 220704677 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220835759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211414 + ... + 212455.

It is an arithmetic number, because the mean of its divisors is an integer number (55315035).

Almost surely, 2^220835749 is an apocalyptic number.

It is an amenable number.

220835749 is a deficient number, since it is larger than the sum of its proper divisors (424391).

220835749 is an equidigital number, since it uses as much as digits as its factorization.

220835749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424390.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 220835749 is about 14860.5433615329. The cubic root of 220835749 is about 604.4445408379. Note that the first 3 decimals are identical.

The spelling of 220835749 in words is "two hundred twenty million, eight hundred thirty-five thousand, seven hundred forty-nine".