7240621 has 4 divisors (see below), whose sum is σ = 7246044. Its totient is φ = 7235200.

The previous prime is 7240613. The next prime is 7240627. The reversal of 7240621 is 1260427.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3200521 + 4040100 = 1789^2 + 2010^2 .

It is a cyclic number.

It is not a de Polignac number, because 7240621 - 2³ = 7240613 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 plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 7240592 and 7240601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7240627) 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, 861 + ... + 3901.

It is an arithmetic number, because the mean of its divisors is an integer number (1811511).

Almost surely, 2^7240621 is an apocalyptic number.

It is an amenable number.

7240621 is a deficient number, since it is larger than the sum of its proper divisors (5423).

7240621 is a wasteful number, since it uses less digits than its factorization.

7240621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5422.

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

The square root of 7240621 is about 2690.8402033566. The cubic root of 7240621 is about 193.4603363564.

It can be divided in two parts, 72406 and 21, that added together give a palindrome (72427).

The spelling of 7240621 in words is "seven million, two hundred forty thousand, six hundred twenty-one".