7906405 has 8 divisors (see below), whose sum is σ = 10217592. Its totient is φ = 5838528.

The previous prime is 7906403. The next prime is 7906417. The reversal of 7906405 is 5046097.

It can be written as a sum of positive squares in 4 ways, for example, as 431649 + 7474756 = 657^2 + 2734^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 7906405 - 2¹ = 7906403 is a prime.

It is a super-2 number, since 2×7906405² = 125022480048050, which contains 22 as substring.

It is a Duffinian number.

7906405 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7906403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60754 + ... + 60883.

It is an arithmetic number, because the mean of its divisors is an integer number (1277199).

Almost surely, 2^7906405 is an apocalyptic number.

It is an amenable number.

7906405 is a deficient number, since it is larger than the sum of its proper divisors (2311187).

7906405 is a wasteful number, since it uses less digits than its factorization.

7906405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121655.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 7906405 is about 2811.8330320273. The cubic root of 7906405 is about 199.2169800663.

The spelling of 7906405 in words is "seven million, nine hundred six thousand, four hundred five".