7381645 has 4 divisors (see below), whose sum is σ = 8857980. Its totient is φ = 5905312.

The previous prime is 7381639. The next prime is 7381651. The reversal of 7381645 is 5461837.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5461837 = 307 ⋅17791.

It is an interprime number because it is at equal distance from previous prime (7381639) and next prime (7381651).

It can be written as a sum of positive squares in 2 ways, for example, as 1320201 + 6061444 = 1149^2 + 2462^2 .

It is a cyclic number.

It is not a de Polignac number, because 7381645 - 2⁵ = 7381613 is a prime.

It is a super-3 number, since 3×7381645³ (a number of 22 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7381645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 738160 + ... + 738169.

It is an arithmetic number, because the mean of its divisors is an integer number (2214495).

Almost surely, 2^7381645 is an apocalyptic number.

It is an amenable number.

7381645 is a deficient number, since it is larger than the sum of its proper divisors (1476335).

7381645 is a wasteful number, since it uses less digits than its factorization.

7381645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476334.

The product of its digits is 20160, while the sum is 34.

The square root of 7381645 is about 2716.9182910055. The cubic root of 7381645 is about 194.7082641736.

It can be divided in two parts, 73 and 81645, that added together give a palindrome (81718).

The spelling of 7381645 in words is "seven million, three hundred eighty-one thousand, six hundred forty-five".