40421231 has 4 divisors (see below), whose sum is σ = 40438464. Its totient is φ = 40404000.

The previous prime is 40421221. The next prime is 40421239. The reversal of 40421231 is 13212404.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40421231 is a prime.

It is a super-2 number, since 2×40421231² = 3267751831110722, 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 (40421239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4415 + ... + 10016.

It is an arithmetic number, because the mean of its divisors is an integer number (10109616).

Almost surely, 2^40421231 is an apocalyptic number.

40421231 is a deficient number, since it is larger than the sum of its proper divisors (17233).

40421231 is a wasteful number, since it uses less digits than its factorization.

40421231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17232.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 40421231 is about 6357.7693415222. The cubic root of 40421231 is about 343.1914912457.

Adding to 40421231 its reverse (13212404), we get a palindrome (53633635).

The spelling of 40421231 in words is "forty million, four hundred twenty-one thousand, two hundred thirty-one".