7421645 has 32 divisors (see below), whose sum is σ = 11425536. Its totient is φ = 4492800.

The previous prime is 7421641. The next prime is 7421677. The reversal of 7421645 is 5461247.

It is not a de Polignac number, because 7421645 - 2² = 7421641 is a prime.

It is a super-3 number, since 3×7421645³ (a number of 22 digits) contains 333 as substring.

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 (7421641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13985 + ... + 14505.

It is an arithmetic number, because the mean of its divisors is an integer number (357048).

Almost surely, 2^7421645 is an apocalyptic number.

It is an amenable number.

7421645 is a deficient number, since it is larger than the sum of its proper divisors (4003891).

7421645 is a wasteful number, since it uses less digits than its factorization.

7421645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581.

The product of its digits is 6720, while the sum is 29.

The square root of 7421645 is about 2724.2696268908. The cubic root of 7421645 is about 195.0593288682.

The spelling of 7421645 in words is "seven million, four hundred twenty-one thousand, six hundred forty-five".