742621 has 4 divisors (see below), whose sum is σ = 810144. Its totient is φ = 675100.

The previous prime is 742619. The next prime is 742657. The reversal of 742621 is 126247.

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 742621 - 2¹ = 742619 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 742592 and 742601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (742681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33745 + ... + 33766.

It is an arithmetic number, because the mean of its divisors is an integer number (202536).

2⁷⁴²⁶²¹ is an apocalyptic number.

It is an amenable number.

742621 is a deficient number, since it is larger than the sum of its proper divisors (67523).

742621 is a wasteful number, since it uses less digits than its factorization.

742621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67522.

The product of its digits is 672, while the sum is 22.

The square root of 742621 is about 861.7546054417. The cubic root of 742621 is about 90.5570796676.

Adding to 742621 its reverse (126247), we get a palindrome (868868).

It can be divided in two parts, 7426 and 21, that added together give a palindrome (7447).

The spelling of 742621 in words is "seven hundred forty-two thousand, six hundred twenty-one".