7921145 has 16 divisors (see below), whose sum is σ = 9980928. Its totient is φ = 6027840.

The previous prime is 7921141. The next prime is 7921153. The reversal of 7921145 is 5411297.

7921145 = 6² + 7² + ... + 287².

7921145 is nontrivially palindromic in base 14.

It is not a de Polignac number, because 7921145 - 2² = 7921141 is a prime.

It is a super-2 number, since 2×7921145² = 125489076222050, which contains 22 as substring.

It is a d-powerful number, because it can be written as 7⁸ + 9⁵ + 2²¹ + 1 + 1 + 4² + 5³ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7921141) 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, 8240 + ... + 9150.

It is an arithmetic number, because the mean of its divisors is an integer number (623808).

Almost surely, 2^7921145 is an apocalyptic number.

It is an amenable number.

7921145 is a deficient number, since it is larger than the sum of its proper divisors (2059783).

7921145 is a wasteful number, since it uses less digits than its factorization.

7921145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000.

The product of its digits is 2520, while the sum is 29.

The square root of 7921145 is about 2814.4528775590. The cubic root of 7921145 is about 199.3407040323.

The spelling of 7921145 in words is "seven million, nine hundred twenty-one thousand, one hundred forty-five".