40135421 has 4 divisors (see below), whose sum is σ = 41430144. Its totient is φ = 38840700.

The previous prime is 40135411. The next prime is 40135423. The reversal of 40135421 is 12453104.

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 a cyclic number.

It is not a de Polignac number, because 40135421 - 2¹⁸ = 39873277 is a prime.

It is a super-2 number, since 2×40135421² = 3221704037694482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40135393 and 40135402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40135423) 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, 647315 + ... + 647376.

It is an arithmetic number, because the mean of its divisors is an integer number (10357536).

Almost surely, 2^40135421 is an apocalyptic number.

It is an amenable number.

40135421 is a deficient number, since it is larger than the sum of its proper divisors (1294723).

40135421 is a wasteful number, since it uses less digits than its factorization.

40135421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294722.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 40135421 is about 6335.2522443862. The cubic root of 40135421 is about 342.3806990323.

Adding to 40135421 its reverse (12453104), we get a palindrome (52588525).

The spelling of 40135421 in words is "forty million, one hundred thirty-five thousand, four hundred twenty-one".