221790739 has 4 divisors (see below), whose sum is σ = 221886424. Its totient is φ = 221695056.

The previous prime is 221790733. The next prime is 221790757. The reversal of 221790739 is 937097122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221790739 - 2⁵ = 221790707 is a prime.

It is a super-2 number, since 2×221790739² = 98382263812332242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221790733) 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, 44277 + ... + 49030.

It is an arithmetic number, because the mean of its divisors is an integer number (55471606).

Almost surely, 2^221790739 is an apocalyptic number.

221790739 is a deficient number, since it is larger than the sum of its proper divisors (95685).

221790739 is an equidigital number, since it uses as much as digits as its factorization.

221790739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95684.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 221790739 is about 14892.6404307631. The cubic root of 221790739 is about 605.3145817484.

The spelling of 221790739 in words is "two hundred twenty-one million, seven hundred ninety thousand, seven hundred thirty-nine".