742072391 has 4 divisors (see below), whose sum is σ = 774336432. Its totient is φ = 709808352.

The previous prime is 742072363. The next prime is 742072399. The reversal of 742072391 is 193270247.

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 742072391 - 2¹⁰ = 742071367 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 (742072399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16131986 + ... + 16132031.

It is an arithmetic number, because the mean of its divisors is an integer number (193584108).

Almost surely, 2^742072391 is an apocalyptic number.

742072391 is a deficient number, since it is larger than the sum of its proper divisors (32264041).

742072391 is a wasteful number, since it uses less digits than its factorization.

742072391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32264040.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 742072391 is about 27241.0056899521. The cubic root of 742072391 is about 905.3477458526.

The spelling of 742072391 in words is "seven hundred forty-two million, seventy-two thousand, three hundred ninety-one".