138185240 has 16 divisors (see below), whose sum is σ = 310916880. Its totient is φ = 55274080.

The previous prime is 138185239. The next prime is 138185249. The reversal of 138185240 is 42581831.

It is a junction number, because it is equal to n+sod(n) for n = 138185197 and 138185206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138185249) 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, 1727276 + ... + 1727355.

It is an arithmetic number, because the mean of its divisors is an integer number (19432305).

Almost surely, 2^138185240 is an apocalyptic number.

138185240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138185240 is an abundant number, since it is smaller than the sum of its proper divisors (172731640).

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

138185240 is a wasteful number, since it uses less digits than its factorization.

138185240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3454642 (or 3454638 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 138185240 is about 11755.2218184090. The cubic root of 138185240 is about 516.9960429544.

The spelling of 138185240 in words is "one hundred thirty-eight million, one hundred eighty-five thousand, two hundred forty".