742389 has 4 divisors (see below), whose sum is σ = 989856. Its totient is φ = 494924.

The previous prime is 742381. The next prime is 742393. The reversal of 742389 is 983247.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 742389 - 2³ = 742381 is a prime.

It is a super-2 number, since 2×742389² = 1102282854642, which contains 22 as substring.

It is a d-powerful number, because it can be written as 7 + 4⁵ + 3¹¹ + 2 + 8⁵ + 9⁶ .

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (742381) 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, 123729 + ... + 123734.

It is an arithmetic number, because the mean of its divisors is an integer number (247464).

2⁷⁴²³⁸⁹ is an apocalyptic number.

It is an amenable number.

742389 is a deficient number, since it is larger than the sum of its proper divisors (247467).

742389 is a wasteful number, since it uses less digits than its factorization.

742389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247466.

The product of its digits is 12096, while the sum is 33.

The square root of 742389 is about 861.6199858406. The cubic root of 742389 is about 90.5476484635.

It can be divided in two parts, 74238 and 9, that added together give a palindrome (74247).

The spelling of 742389 in words is "seven hundred forty-two thousand, three hundred eighty-nine".