7400521 has 4 divisors (see below), whose sum is σ = 7501972. Its totient is φ = 7299072.

The previous prime is 7400507. The next prime is 7400527. The reversal of 7400521 is 1250047.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1250047 = 163 ⋅7669.

It can be written as a sum of positive squares in 2 ways, for example, as 5812921 + 1587600 = 2411^2 + 1260^2 .

It is a cyclic number.

It is not a de Polignac number, because 7400521 - 2⁵ = 7400489 is a prime.

It is a super-2 number, since 2×7400521² = 109535422142882, which contains 22 as substring.

It is a Duffinian number.

7400521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7400527) 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 3 ways as a sum of consecutive naturals, for example, 50616 + ... + 50761.

It is an arithmetic number, because the mean of its divisors is an integer number (1875493).

Almost surely, 2^7400521 is an apocalyptic number.

It is an amenable number.

7400521 is a deficient number, since it is larger than the sum of its proper divisors (101451).

7400521 is a wasteful number, since it uses less digits than its factorization.

7400521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101450.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 7400521 is about 2720.3898617661. The cubic root of 7400521 is about 194.8740892192.

Adding to 7400521 its reverse (1250047), we get a palindrome (8650568).

It can be divided in two parts, 7400 and 521, that added together give a square (7921 = 89²).

The spelling of 7400521 in words is "seven million, four hundred thousand, five hundred twenty-one".