40213639 has 2 divisors, whose sum is σ = 40213640. Its totient is φ = 40213638.

The previous prime is 40213627. The next prime is 40213651. The reversal of 40213639 is 93631204.

40213639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (40213627) and next prime (40213651).

It is a cyclic number.

It is not a de Polignac number, because 40213639 - 2¹³ = 40205447 is a prime.

It is equal to p_2445841 and since 40213639 and 2445841 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40513639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20106819 + 20106820.

It is an arithmetic number, because the mean of its divisors is an integer number (20106820).

Almost surely, 2^40213639 is an apocalyptic number.

40213639 is a deficient number, since it is larger than the sum of its proper divisors (1).

40213639 is an equidigital number, since it uses as much as digits as its factorization.

40213639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 40213639 is about 6341.4224744926. The cubic root of 40213639 is about 342.6029711525.

It can be divided in two parts, 402 and 13639, that added together give a palindrome (14041).

The spelling of 40213639 in words is "forty million, two hundred thirteen thousand, six hundred thirty-nine".