135626399 has 4 divisors (see below), whose sum is σ = 137260536. Its totient is φ = 133992264.

The previous prime is 135626347. The next prime is 135626437. The reversal of 135626399 is 993626531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993626531 = 743 ⋅1337317.

It is a cyclic number.

It is not a de Polignac number, because 135626399 - 2⁸ = 135626143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135616399) 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, 816944 + ... + 817109.

It is an arithmetic number, because the mean of its divisors is an integer number (34315134).

Almost surely, 2^135626399 is an apocalyptic number.

135626399 is a deficient number, since it is larger than the sum of its proper divisors (1634137).

135626399 is an equidigital number, since it uses as much as digits as its factorization.

135626399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634136.

The product of its digits is 262440, while the sum is 44.

The square root of 135626399 is about 11645.8747631940. The cubic root of 135626399 is about 513.7849875632.

The spelling of 135626399 in words is "one hundred thirty-five million, six hundred twenty-six thousand, three hundred ninety-nine".