8726405 has 4 divisors (see below), whose sum is σ = 10471692. Its totient is φ = 6981120.

The previous prime is 8726401. The next prime is 8726447. The reversal of 8726405 is 5046278.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5046278 = 2 ⋅2523139.

It can be written as a sum of positive squares in 2 ways, for example, as 3189796 + 5536609 = 1786^2 + 2353^2 .

It is not a de Polignac number, because 8726405 - 2² = 8726401 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 (8726401) 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, 872636 + ... + 872645.

It is an arithmetic number, because the mean of its divisors is an integer number (2617923).

Almost surely, 2^8726405 is an apocalyptic number.

It is an amenable number.

8726405 is a deficient number, since it is larger than the sum of its proper divisors (1745287).

8726405 is a wasteful number, since it uses less digits than its factorization.

8726405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745286.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 8726405 is about 2954.0489163181. The cubic root of 8726405 is about 205.8788759157.

The spelling of 8726405 in words is "eight million, seven hundred twenty-six thousand, four hundred five".