7253921 has 4 divisors (see below), whose sum is σ = 7325844. Its totient is φ = 7182000.

The previous prime is 7253903. The next prime is 7253927. The reversal of 7253921 is 1293527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1293527 = 379 ⋅3413.

It can be written as a sum of positive squares in 2 ways, for example, as 2927521 + 4326400 = 1711^2 + 2080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7253921 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7253927) 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, 35810 + ... + 36011.

It is an arithmetic number, because the mean of its divisors is an integer number (1831461).

Almost surely, 2^7253921 is an apocalyptic number.

It is an amenable number.

7253921 is a deficient number, since it is larger than the sum of its proper divisors (71923).

7253921 is a wasteful number, since it uses less digits than its factorization.

7253921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71922.

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

The square root of 7253921 is about 2693.3104165692. The cubic root of 7253921 is about 193.5787170244.

The spelling of 7253921 in words is "seven million, two hundred fifty-three thousand, nine hundred twenty-one".