40505579 has 4 divisors (see below), whose sum is σ = 40526640. Its totient is φ = 40484520.

The previous prime is 40505567. The next prime is 40505617. The reversal of 40505579 is 97550504.

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

It is a cyclic number.

It is not a de Polignac number, because 40505579 - 2²⁰ = 39457003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40505519) 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, 7319 + ... + 11600.

It is an arithmetic number, because the mean of its divisors is an integer number (10131660).

Almost surely, 2^40505579 is an apocalyptic number.

40505579 is a deficient number, since it is larger than the sum of its proper divisors (21061).

40505579 is a wasteful number, since it uses less digits than its factorization.

40505579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21060.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 40505579 is about 6364.3993432216. The cubic root of 40505579 is about 343.4300408340.

The spelling of 40505579 in words is "forty million, five hundred five thousand, five hundred seventy-nine".