742978221 has 16 divisors (see below), whose sum is σ = 1010608704. Its totient is φ = 485357184.

The previous prime is 742978199. The next prime is 742978237. The reversal of 742978221 is 122879247.

742978221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 742978221 - 2⁵ = 742978189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (742978121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146490 + ... + 151476.

It is an arithmetic number, because the mean of its divisors is an integer number (63163044).

Almost surely, 2^742978221 is an apocalyptic number.

It is an amenable number.

742978221 is a deficient number, since it is larger than the sum of its proper divisors (267630483).

742978221 is a wasteful number, since it uses less digits than its factorization.

742978221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5980.

The product of its digits is 112896, while the sum is 42.

The square root of 742978221 is about 27257.6268409412. The cubic root of 742978221 is about 905.7159748358.

The spelling of 742978221 in words is "seven hundred forty-two million, nine hundred seventy-eight thousand, two hundred twenty-one".