40424391 has 24 divisors (see below), whose sum is σ = 67136160. Its totient is φ = 22959936.

The previous prime is 40424369. The next prime is 40424393. The reversal of 40424391 is 19342404.

It is not a de Polignac number, because 40424391 - 2⁶ = 40424327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40424393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9045 + ... + 12753.

It is an arithmetic number, because the mean of its divisors is an integer number (2797340).

Almost surely, 2^40424391 is an apocalyptic number.

40424391 is a deficient number, since it is larger than the sum of its proper divisors (26711769).

40424391 is a wasteful number, since it uses less digits than its factorization.

40424391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3895 (or 3892 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 40424391 is about 6358.0178515006. The cubic root of 40424391 is about 343.2004342098.

Adding to 40424391 its reverse (19342404), we get a palindrome (59766795).

The spelling of 40424391 in words is "forty million, four hundred twenty-four thousand, three hundred ninety-one".