742745 has 4 divisors (see below), whose sum is σ = 891300. Its totient is φ = 594192.

The previous prime is 742723. The next prime is 742757. The reversal of 742745 is 547247.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547247 = 17 ⋅32191.

It can be written as a sum of positive squares in 2 ways, for example, as 565504 + 177241 = 752^2 + 421^2 .

It is a cyclic number.

It is not a de Polignac number, because 742745 - 2⁶ = 742681 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74270 + ... + 74279.

It is an arithmetic number, because the mean of its divisors is an integer number (222825).

2⁷⁴²⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

742745 is a deficient number, since it is larger than the sum of its proper divisors (148555).

742745 is a wasteful number, since it uses less digits than its factorization.

742745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148554.

The product of its digits is 7840, while the sum is 29.

The square root of 742745 is about 861.8265486744. The cubic root of 742745 is about 90.5621196781.

The spelling of 742745 in words is "seven hundred forty-two thousand, seven hundred forty-five".