7256405 has 8 divisors (see below), whose sum is σ = 9377592. Its totient is φ = 5358528.

The previous prime is 7256401. The next prime is 7256497. The reversal of 7256405 is 5046527.

It can be written as a sum of positive squares in 4 ways, for example, as 1620529 + 5635876 = 1273^2 + 2374^2 .

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 7256405 - 2² = 7256401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7256401) 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, 55754 + ... + 55883.

It is an arithmetic number, because the mean of its divisors is an integer number (1172199).

Almost surely, 2^7256405 is an apocalyptic number.

It is an amenable number.

7256405 is a deficient number, since it is larger than the sum of its proper divisors (2121187).

7256405 is a wasteful number, since it uses less digits than its factorization.

7256405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111655.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 7256405 is about 2693.7715196356. The cubic root of 7256405 is about 193.6008105771.

The spelling of 7256405 in words is "seven million, two hundred fifty-six thousand, four hundred five".