7381145 has 8 divisors (see below), whose sum is σ = 9378504. Its totient is φ = 5557504.

The previous prime is 7381141. The next prime is 7381159. The reversal of 7381145 is 5411837.

It can be written as a sum of positive squares in 4 ways, for example, as 2483776 + 4897369 = 1576^2 + 2213^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7381145 - 2² = 7381141 is a prime.

It is a super-2 number, since 2×7381145² = 108962603022050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7381141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43334 + ... + 43503.

It is an arithmetic number, because the mean of its divisors is an integer number (1172313).

Almost surely, 2^7381145 is an apocalyptic number.

It is an amenable number.

7381145 is a deficient number, since it is larger than the sum of its proper divisors (1997359).

7381145 is a wasteful number, since it uses less digits than its factorization.

7381145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86859.

The product of its digits is 3360, while the sum is 29.

The square root of 7381145 is about 2716.8262734301. The cubic root of 7381145 is about 194.7038678486.

It can be divided in two parts, 73 and 81145, that added together give a palindrome (81218).

The spelling of 7381145 in words is "seven million, three hundred eighty-one thousand, one hundred forty-five".