40345591 has 16 divisors (see below), whose sum is σ = 48117888. Its totient is φ = 33343200.

The previous prime is 40345579. The next prime is 40345609. The reversal of 40345591 is 19554304.

It is not a de Polignac number, because 40345591 - 2⁵ = 40345559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40345891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7476 + ... + 11686.

It is an arithmetic number, because the mean of its divisors is an integer number (3007368).

Almost surely, 2^40345591 is an apocalyptic number.

40345591 is a deficient number, since it is larger than the sum of its proper divisors (7772297).

40345591 is a wasteful number, since it uses less digits than its factorization.

40345591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4302.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 40345591 is about 6351.8179287508. The cubic root of 40345591 is about 342.9772868707.

Adding to 40345591 its reverse (19554304), we get a palindrome (59899895).

The spelling of 40345591 in words is "forty million, three hundred forty-five thousand, five hundred ninety-one".