742905221 has 4 divisors (see below), whose sum is σ = 775205472. Its totient is φ = 710604972.

The previous prime is 742905217. The next prime is 742905239. The reversal of 742905221 is 122509247.

742905221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 742905221 - 2² = 742905217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (742901221) 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, 16150091 + ... + 16150136.

It is an arithmetic number, because the mean of its divisors is an integer number (193801368).

Almost surely, 2^742905221 is an apocalyptic number.

It is an amenable number.

742905221 is a deficient number, since it is larger than the sum of its proper divisors (32300251).

742905221 is a wasteful number, since it uses less digits than its factorization.

742905221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32300250.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 742905221 is about 27256.2877332919. The cubic root of 742905221 is about 905.6863106950.

The spelling of 742905221 in words is "seven hundred forty-two million, nine hundred five thousand, two hundred twenty-one".