40312421 has 2 divisors, whose sum is σ = 40312422. Its totient is φ = 40312420.

The previous prime is 40312403. The next prime is 40312439. The reversal of 40312421 is 12421304.

It is a balanced prime because it is at equal distance from previous prime (40312403) and next prime (40312439).

It can be written as a sum of positive squares in only one way, i.e., 20376196 + 19936225 = 4514^2 + 4465^2 .

It is a cyclic number.

It is not a de Polignac number, because 40312421 - 2¹⁴ = 40296037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40312421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40302421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20156210 + 20156211.

It is an arithmetic number, because the mean of its divisors is an integer number (20156211).

Almost surely, 2^40312421 is an apocalyptic number.

It is an amenable number.

40312421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40312421 is an equidigital number, since it uses as much as digits as its factorization.

40312421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 40312421 is about 6349.2063283532. The cubic root of 40312421 is about 342.8832685366.

Adding to 40312421 its reverse (12421304), we get a palindrome (52733725).

The spelling of 40312421 in words is "forty million, three hundred twelve thousand, four hundred twenty-one".