138635445 has 16 divisors (see below), whose sum is σ = 238879872. Its totient is φ = 68251200.

The previous prime is 138635443. The next prime is 138635447. The reversal of 138635445 is 544536831.

It is an interprime number because it is at equal distance from previous prime (138635443) and next prime (138635447).

It is not a de Polignac number, because 138635445 - 2¹ = 138635443 is a prime.

It is a super-2 number, since 2×138635445² = 38439573220696050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138635443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355281 + ... + 355670.

It is an arithmetic number, because the mean of its divisors is an integer number (14929992).

Almost surely, 2^138635445 is an apocalyptic number.

138635445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138635445 is a deficient number, since it is larger than the sum of its proper divisors (100244427).

138635445 is a wasteful number, since it uses less digits than its factorization.

138635445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710972.

The product of its digits is 172800, while the sum is 39.

The square root of 138635445 is about 11774.3553963688. The cubic root of 138635445 is about 517.5568888894.

The spelling of 138635445 in words is "one hundred thirty-eight million, six hundred thirty-five thousand, four hundred forty-five".