40421391 has 8 divisors (see below), whose sum is σ = 53925120. Its totient is φ = 26932632.

The previous prime is 40421383. The next prime is 40421399. The reversal of 40421391 is 19312404.

It is an interprime number because it is at equal distance from previous prime (40421383) and next prime (40421399).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40421391 - 2³ = 40421383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40421399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6826 + ... + 11288.

It is an arithmetic number, because the mean of its divisors is an integer number (6740640).

Almost surely, 2^40421391 is an apocalyptic number.

40421391 is a deficient number, since it is larger than the sum of its proper divisors (13503729).

40421391 is a wasteful number, since it uses less digits than its factorization.

40421391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7485.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 40421391 is about 6357.7819245394. The cubic root of 40421391 is about 343.1919440652.

Adding to 40421391 its reverse (19312404), we get a palindrome (59733795).

The spelling of 40421391 in words is "forty million, four hundred twenty-one thousand, three hundred ninety-one".