138971740 has 24 divisors (see below), whose sum is σ = 292142592. Its totient is φ = 55531200.

The previous prime is 138971737. The next prime is 138971747. The reversal of 138971740 is 47179831.

It is a junction number, because it is equal to n+sod(n) for n = 138971693 and 138971702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138971747) 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, 20002 + ... + 26038.

It is an arithmetic number, because the mean of its divisors is an integer number (12172608).

Almost surely, 2^138971740 is an apocalyptic number.

138971740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138971740 is an abundant number, since it is smaller than the sum of its proper divisors (153170852).

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

138971740 is a wasteful number, since it uses less digits than its factorization.

138971740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7197 (or 7195 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 138971740 is about 11788.6275706717. The cubic root of 138971740 is about 517.9750389228.

The spelling of 138971740 in words is "one hundred thirty-eight million, nine hundred seventy-one thousand, seven hundred forty".