138037720 has 32 divisors (see below), whose sum is σ = 324090720. Its totient is φ = 52814080.

The previous prime is 138037681. The next prime is 138037729. The reversal of 138037720 is 27730831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138037729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74101 + ... + 75940.

It is an arithmetic number, because the mean of its divisors is an integer number (10127835).

Almost surely, 2^138037720 is an apocalyptic number.

138037720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138037720 is an abundant number, since it is smaller than the sum of its proper divisors (186053000).

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

138037720 is a wasteful number, since it uses less digits than its factorization.

138037720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150075 (or 150071 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 138037720 is about 11748.9454845956. The cubic root of 138037720 is about 516.8120039737.

The spelling of 138037720 in words is "one hundred thirty-eight million, thirty-seven thousand, seven hundred twenty".