40405193 has 4 divisors (see below), whose sum is σ = 40423440. Its totient is φ = 40386948.

The previous prime is 40405187. The next prime is 40405217. The reversal of 40405193 is 39150404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40405193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40405163) 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, 5255 + ... + 10412.

It is an arithmetic number, because the mean of its divisors is an integer number (10105860).

Almost surely, 2^40405193 is an apocalyptic number.

It is an amenable number.

40405193 is a deficient number, since it is larger than the sum of its proper divisors (18247).

40405193 is a wasteful number, since it uses less digits than its factorization.

40405193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18246.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 40405193 is about 6356.5079249538. The cubic root of 40405193 is about 343.1460956856.

Adding to 40405193 its reverse (39150404), we get a palindrome (79555597).

The spelling of 40405193 in words is "forty million, four hundred five thousand, one hundred ninety-three".