7523921 has 4 divisors (see below), whose sum is σ = 7851072. Its totient is φ = 7196772.

The previous prime is 7523909. The next prime is 7523927. The reversal of 7523921 is 1293257.

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.

It is a cyclic number.

It is not a de Polignac number, because 7523921 - 2¹⁴ = 7507537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7523927) 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, 163541 + ... + 163586.

It is an arithmetic number, because the mean of its divisors is an integer number (1962768).

Almost surely, 2^7523921 is an apocalyptic number.

It is an amenable number.

7523921 is a deficient number, since it is larger than the sum of its proper divisors (327151).

7523921 is a wasteful number, since it uses less digits than its factorization.

7523921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327150.

The product of its digits is 3780, while the sum is 29.

The square root of 7523921 is about 2742.9766677826. The cubic root of 7523921 is about 195.9512668651.

The spelling of 7523921 in words is "seven million, five hundred twenty-three thousand, nine hundred twenty-one".