40530391 has 12 divisors (see below), whose sum is σ = 44887752. Its totient is φ = 36290000.

The previous prime is 40530389. The next prime is 40530407. The reversal of 40530391 is 19303504.

It is not a de Polignac number, because 40530391 - 2¹ = 40530389 is a prime.

It is a super-2 number, since 2×40530391² = 3285425189225762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40530331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 212106 + ... + 212296.

It is an arithmetic number, because the mean of its divisors is an integer number (3740646).

Almost surely, 2^40530391 is an apocalyptic number.

40530391 is a deficient number, since it is larger than the sum of its proper divisors (4357361).

40530391 is a wasteful number, since it uses less digits than its factorization.

40530391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 40530391 is about 6366.3483253746. The cubic root of 40530391 is about 343.5001500804.

Adding to 40530391 its reverse (19303504), we get a palindrome (59833895).

The spelling of 40530391 in words is "forty million, five hundred thirty thousand, three hundred ninety-one".