40026421 has 4 divisors (see below), whose sum is σ = 40957312. Its totient is φ = 39095532.

The previous prime is 40026419. The next prime is 40026433. The reversal of 40026421 is 12462004.

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 40026421 - 2¹ = 40026419 is a prime.

It is a super-2 number, since 2×40026421² = 3204228756138482, 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 (40026451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465381 + ... + 465466.

It is an arithmetic number, because the mean of its divisors is an integer number (10239328).

Almost surely, 2^40026421 is an apocalyptic number.

It is an amenable number.

40026421 is a deficient number, since it is larger than the sum of its proper divisors (930891).

40026421 is an equidigital number, since it uses as much as digits as its factorization.

40026421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930890.

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

The square root of 40026421 is about 6326.6437389820. The cubic root of 40026421 is about 342.0704715533.

Adding to 40026421 its reverse (12462004), we get a palindrome (52488425).

The spelling of 40026421 in words is "forty million, twenty-six thousand, four hundred twenty-one".