7543997 has 4 divisors (see below), whose sum is σ = 7552956. Its totient is φ = 7535040.

The previous prime is 7543979. The next prime is 7544027. The reversal of 7543997 is 7993457.

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: 7993457 = 79 ⋅101183.

It can be written as a sum of positive squares in 2 ways, for example, as 4519876 + 3024121 = 2126^2 + 1739^2 .

It is a cyclic number.

It is not a de Polignac number, because 7543997 - 2¹⁸ = 7281853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7543957) 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, 3068 + ... + 4949.

It is an arithmetic number, because the mean of its divisors is an integer number (1888239).

Almost surely, 2^7543997 is an apocalyptic number.

It is an amenable number.

7543997 is a deficient number, since it is larger than the sum of its proper divisors (8959).

7543997 is an equidigital number, since it uses as much as digits as its factorization.

7543997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8958.

The product of its digits is 238140, while the sum is 44.

The square root of 7543997 is about 2746.6337578935. The cubic root of 7543997 is about 196.1253969880.

The spelling of 7543997 in words is "seven million, five hundred forty-three thousand, nine hundred ninety-seven".