40235421 has 4 divisors (see below), whose sum is σ = 53647232. Its totient is φ = 26823612.

The previous prime is 40235399. The next prime is 40235449. The reversal of 40235421 is 12453204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 40235421 - 2¹⁵ = 40202653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40235491) 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, 6705901 + ... + 6705906.

It is an arithmetic number, because the mean of its divisors is an integer number (13411808).

Almost surely, 2^40235421 is an apocalyptic number.

It is an amenable number.

40235421 is a deficient number, since it is larger than the sum of its proper divisors (13411811).

40235421 is a wasteful number, since it uses less digits than its factorization.

40235421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13411810.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 40235421 is about 6343.1396800007. The cubic root of 40235421 is about 342.6648177558.

Adding to 40235421 its reverse (12453204), we get a palindrome (52688625).

The spelling of 40235421 in words is "forty million, two hundred thirty-five thousand, four hundred twenty-one".