138011240 has 16 divisors (see below), whose sum is σ = 310525380. Its totient is φ = 55204480.

The previous prime is 138011227. The next prime is 138011243. The reversal of 138011240 is 42110831.

It can be written as a sum of positive squares in 2 ways, for example, as 129095044 + 8916196 = 11362^2 + 2986^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (138011243) 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, 1725101 + ... + 1725180.

Almost surely, 2^138011240 is an apocalyptic number.

138011240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138011240 is an abundant number, since it is smaller than the sum of its proper divisors (172514140).

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

138011240 is a wasteful number, since it uses less digits than its factorization.

138011240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3450292 (or 3450288 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 138011240 is about 11747.8185209000. The cubic root of 138011240 is about 516.7789548984.

The spelling of 138011240 in words is "one hundred thirty-eight million, eleven thousand, two hundred forty".