7421522 has 4 divisors (see below), whose sum is σ = 11132286. Its totient is φ = 3710760.

The previous prime is 7421509. The next prime is 7421539. The reversal of 7421522 is 2251247.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2251247 = 73 ⋅30839.

It can be written as a sum of positive squares in only one way, i.e., 7392961 + 28561 = 2719^2 + 169^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1855379 + ... + 1855382.

Almost surely, 2^7421522 is an apocalyptic number.

7421522 is a deficient number, since it is larger than the sum of its proper divisors (3710764).

7421522 is a wasteful number, since it uses less digits than its factorization.

7421522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3710763.

The product of its digits is 1120, while the sum is 23.

The square root of 7421522 is about 2724.2470519393. The cubic root of 7421522 is about 195.0582512801.

Adding to 7421522 its reverse (2251247), we get a palindrome (9672769).

The spelling of 7421522 in words is "seven million, four hundred twenty-one thousand, five hundred twenty-two".