7921245 has 16 divisors (see below), whose sum is σ = 12969792. Its totient is φ = 4126080.

The previous prime is 7921237. The next prime is 7921247. The reversal of 7921245 is 5421297.

It is not a de Polignac number, because 7921245 - 2³ = 7921237 is a prime.

It is a super-2 number, since 2×7921245² = 125492244700050, which contains 22 as substring.

7921245 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7921247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5496 + ... + 6785.

It is an arithmetic number, because the mean of its divisors is an integer number (810612).

Almost surely, 2^7921245 is an apocalyptic number.

It is an amenable number.

7921245 is a deficient number, since it is larger than the sum of its proper divisors (5048547).

7921245 is a wasteful number, since it uses less digits than its factorization.

7921245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12332.

The product of its digits is 5040, while the sum is 30.

The square root of 7921245 is about 2814.4706429451. The cubic root of 7921245 is about 199.3415428835.

The spelling of 7921245 in words is "seven million, nine hundred twenty-one thousand, two hundred forty-five".