40431021 has 8 divisors (see below), whose sum is σ = 54667584. Its totient is φ = 26574240.

The previous prime is 40431019. The next prime is 40431023. The reversal of 40431021 is 12013404.

It is an interprime number because it is at equal distance from previous prime (40431019) and next prime (40431023).

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

It is not a de Polignac number, because 40431021 - 2¹ = 40431019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40431023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94696 + ... + 95121.

It is an arithmetic number, because the mean of its divisors is an integer number (6833448).

Almost surely, 2^40431021 is an apocalyptic number.

It is an amenable number.

40431021 is a deficient number, since it is larger than the sum of its proper divisors (14236563).

40431021 is a wasteful number, since it uses less digits than its factorization.

40431021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189891.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 40431021 is about 6358.5392190345. The cubic root of 40431021 is about 343.2191959395.

Adding to 40431021 its reverse (12013404), we get a palindrome (52444425).

The spelling of 40431021 in words is "forty million, four hundred thirty-one thousand, twenty-one".