40143421 has 4 divisors (see below), whose sum is σ = 40351612. Its totient is φ = 39935232.

The previous prime is 40143403. The next prime is 40143437. The reversal of 40143421 is 12434104.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7080921 + 33062500 = 2661^2 + 5750^2 .

It is a cyclic number.

It is not a de Polignac number, because 40143421 - 2¹³ = 40135229 is a prime.

It is a super-2 number, since 2×40143421² = 3222988499166482, 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 (40143451) 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, 103806 + ... + 104191.

It is an arithmetic number, because the mean of its divisors is an integer number (10087903).

Almost surely, 2^40143421 is an apocalyptic number.

It is an amenable number.

40143421 is a deficient number, since it is larger than the sum of its proper divisors (208191).

40143421 is a wasteful number, since it uses less digits than its factorization.

40143421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208190.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 40143421 is about 6335.8836005722. The cubic root of 40143421 is about 342.4034458858.

Adding to 40143421 its reverse (12434104), we get a palindrome (52577525).

The spelling of 40143421 in words is "forty million, one hundred forty-three thousand, four hundred twenty-one".