135440639 has 2 divisors, whose sum is σ = 135440640. Its totient is φ = 135440638.

The previous prime is 135440621. The next prime is 135440653. The reversal of 135440639 is 936044531.

It is a happy number.

135440639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135440639 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 135440599 and 135440608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135440659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67720319 + 67720320.

It is an arithmetic number, because the mean of its divisors is an integer number (67720320).

Almost surely, 2^135440639 is an apocalyptic number.

135440639 is a deficient number, since it is larger than the sum of its proper divisors (1).

135440639 is an equidigital number, since it uses as much as digits as its factorization.

135440639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 135440639 is about 11637.8966742277. The cubic root of 135440639 is about 513.5503127347.

The spelling of 135440639 in words is "one hundred thirty-five million, four hundred forty thousand, six hundred thirty-nine".