742891 has 2 divisors, whose sum is σ = 742892. Its totient is φ = 742890.

The previous prime is 742817. The next prime is 742897. The reversal of 742891 is 198247.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-742891 is a prime.

It is not a weakly prime, because it can be changed into another prime (742897) 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 as a sum of consecutive naturals, namely, 371445 + 371446.

It is an arithmetic number, because the mean of its divisors is an integer number (371446).

2⁷⁴²⁸⁹¹ is an apocalyptic number.

742891 is a deficient number, since it is larger than the sum of its proper divisors (1).

742891 is an equidigital number, since it uses as much as digits as its factorization.

742891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

The square root of 742891 is about 861.9112483313. The cubic root of 742891 is about 90.5680531650.

Subtracting from 742891 its reverse (198247), we obtain a square (544644 = 738²).

The spelling of 742891 in words is "seven hundred forty-two thousand, eight hundred ninety-one".