40043421 has 24 divisors (see below), whose sum is σ = 64051104. Its totient is φ = 23902560.

The previous prime is 40043417. The next prime is 40043467. The reversal of 40043421 is 12434004.

It is not a de Polignac number, because 40043421 - 2² = 40043417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40043394 and 40043403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40043401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3615 + ... + 9651.

It is an arithmetic number, because the mean of its divisors is an integer number (2668796).

Almost surely, 2^40043421 is an apocalyptic number.

It is an amenable number.

40043421 is a deficient number, since it is larger than the sum of its proper divisors (24007683).

40043421 is a wasteful number, since it uses less digits than its factorization.

40043421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6121 (or 6118 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 40043421 is about 6327.9871207201. The cubic root of 40043421 is about 342.1188926944.

Adding to 40043421 its reverse (12434004), we get a palindrome (52477425).

The spelling of 40043421 in words is "forty million, forty-three thousand, four hundred twenty-one".