742021686 has 48 divisors (see below), whose sum is σ = 1845552384. Its totient is φ = 211064112.

The previous prime is 742021681. The next prime is 742021691. The reversal of 742021686 is 686120247.

742021686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (742021681) and next prime (742021691).

It is a self number, because there is not a number n which added to its sum of digits gives 742021686.

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 23 ways as a sum of consecutive naturals, for example, 15631 + ... + 41573.

It is an arithmetic number, because the mean of its divisors is an integer number (38449008).

Almost surely, 2^742021686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 742021686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (922776192).

742021686 is an abundant number, since it is smaller than the sum of its proper divisors (1103530698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

742021686 is a wasteful number, since it uses less digits than its factorization.

742021686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26185 (or 26182 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 742021686 is about 27240.0749998968. The cubic root of 742021686 is about 905.3271249070.

The spelling of 742021686 in words is "seven hundred forty-two million, twenty-one thousand, six hundred eighty-six".