7740405 has 12 divisors (see below), whose sum is σ = 13416780. Its totient is φ = 4128192.

The previous prime is 7740379. The next prime is 7740407. The reversal of 7740405 is 5040477.

7740405 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 4088484 + 3651921 = 2022^2 + 1911^2 .

It is not a de Polignac number, because 7740405 - 2⁸ = 7740149 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7740407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85960 + ... + 86049.

It is an arithmetic number, because the mean of its divisors is an integer number (1118065).

Almost surely, 2^7740405 is an apocalyptic number.

It is an amenable number.

7740405 is a deficient number, since it is larger than the sum of its proper divisors (5676375).

7740405 is a wasteful number, since it uses less digits than its factorization.

7740405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172020 (or 172017 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 7740405 is about 2782.1583348185. The cubic root of 7740405 is about 197.8128780044.

The spelling of 7740405 in words is "seven million, seven hundred forty thousand, four hundred five".