40401491 has 8 divisors (see below), whose sum is σ = 43565424. Its totient is φ = 37245600.

The previous prime is 40401451. The next prime is 40401497. The reversal of 40401491 is 19410404.

40401491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40401491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40401497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12185 + ... + 15141.

It is an arithmetic number, because the mean of its divisors is an integer number (5445678).

Almost surely, 2^40401491 is an apocalyptic number.

40401491 is a deficient number, since it is larger than the sum of its proper divisors (3163933).

40401491 is a wasteful number, since it uses less digits than its factorization.

40401491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4021.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 40401491 is about 6356.2167206602. The cubic root of 40401491 is about 343.1356154680.

Adding to 40401491 its reverse (19410404), we get a palindrome (59811895).

The spelling of 40401491 in words is "forty million, four hundred one thousand, four hundred ninety-one".