138449532 has 72 divisors (see below), whose sum is σ = 352510704. Its totient is φ = 42272256.

The previous prime is 138449483. The next prime is 138449533. The reversal of 138449532 is 235944831.

It is a super-2 number, since 2×138449532² = 38336545822038048, 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 (138449533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 472378 + ... + 472670.

It is an arithmetic number, because the mean of its divisors is an integer number (4895982).

Almost surely, 2^138449532 is an apocalyptic number.

138449532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138449532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176255352).

138449532 is an abundant number, since it is smaller than the sum of its proper divisors (214061172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138449532 is a wasteful number, since it uses less digits than its factorization.

138449532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559 (or 544 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 138449532 is about 11766.4579207168. The cubic root of 138449532 is about 517.3254338979.

The spelling of 138449532 in words is "one hundred thirty-eight million, four hundred forty-nine thousand, five hundred thirty-two".