742581 has 16 divisors (see below), whose sum is σ = 1257600. Its totient is φ = 424224.

The previous prime is 742579. The next prime is 742591. The reversal of 742581 is 185247.

It is not a de Polignac number, because 742581 - 2¹ = 742579 is a prime.

It is a super-2 number, since 2×742581² = 1102853083122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (742531) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1776 + ... + 2153.

It is an arithmetic number, because the mean of its divisors is an integer number (78600).

2⁷⁴²⁵⁸¹ is an apocalyptic number.

It is an amenable number.

742581 is a deficient number, since it is larger than the sum of its proper divisors (515019).

742581 is a wasteful number, since it uses less digits than its factorization.

742581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3945 (or 3939 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 742581 is about 861.7313966660. The cubic root of 742581 is about 90.5554537381. Note that the first 3 decimals are identical.

The spelling of 742581 in words is "seven hundred forty-two thousand, five hundred eighty-one".