742021685 has 4 divisors (see below), whose sum is σ = 890426028. Its totient is φ = 593617344.

The previous prime is 742021681. The next prime is 742021691. The reversal of 742021685 is 586120247.

742021685 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.

It can be written as a sum of positive squares in 2 ways, for example, as 273472369 + 468549316 = 16537^2 + 21646^2 .

It is a cyclic number.

It is not a de Polignac number, because 742021685 - 2² = 742021681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (742021681) 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, 74202164 + ... + 74202173.

It is an arithmetic number, because the mean of its divisors is an integer number (222606507).

Almost surely, 2^742021685 is an apocalyptic number.

It is an amenable number.

742021685 is a deficient number, since it is larger than the sum of its proper divisors (148404343).

742021685 is a wasteful number, since it uses less digits than its factorization.

742021685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148404342.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 742021685 is about 27240.0749815414. The cubic root of 742021685 is about 905.3271245003.

The spelling of 742021685 in words is "seven hundred forty-two million, twenty-one thousand, six hundred eighty-five".