7740389 has 4 divisors (see below), whose sum is σ = 8195724. Its totient is φ = 7285056.

The previous prime is 7740379. The next prime is 7740407. The reversal of 7740389 is 9830477.

7740389 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5313025 + 2427364 = 2305^2 + 1558^2 .

It is a cyclic number.

It is not a de Polignac number, because 7740389 - 2⁸ = 7740133 is a prime.

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 (7740319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227642 + ... + 227675.

It is an arithmetic number, because the mean of its divisors is an integer number (2048931).

Almost surely, 2^7740389 is an apocalyptic number.

It is an amenable number.

7740389 is a deficient number, since it is larger than the sum of its proper divisors (455335).

7740389 is a wasteful number, since it uses less digits than its factorization.

7740389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455334.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 7740389 is about 2782.1554593516. The cubic root of 7740389 is about 197.8127417063.

The spelling of 7740389 in words is "seven million, seven hundred forty thousand, three hundred eighty-nine".