7487421 has 4 divisors (see below), whose sum is σ = 9983232. Its totient is φ = 4991612.

The previous prime is 7487419. The next prime is 7487437. The reversal of 7487421 is 1247847.

7487421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1247847 = 3 ⋅415949.

It is a cyclic number.

It is not a de Polignac number, because 7487421 - 2¹ = 7487419 is a prime.

It is a super-2 number, since 2×7487421² = 112122946462482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7487401) 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, 1247901 + ... + 1247906.

It is an arithmetic number, because the mean of its divisors is an integer number (2495808).

Almost surely, 2^7487421 is an apocalyptic number.

It is an amenable number.

7487421 is a deficient number, since it is larger than the sum of its proper divisors (2495811).

7487421 is a wasteful number, since it uses less digits than its factorization.

7487421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2495810.

The product of its digits is 12544, while the sum is 33.

The square root of 7487421 is about 2736.3152230692. The cubic root of 7487421 is about 195.6338872206.

The spelling of 7487421 in words is "seven million, four hundred eighty-seven thousand, four hundred twenty-one".