138157266 has 64 divisors (see below), whose sum is σ = 325334016. Its totient is φ = 38707200.

The previous prime is 138157259. The next prime is 138157321. The reversal of 138157266 is 662751831.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39426 + ... + 42786.

It is an arithmetic number, because the mean of its divisors is an integer number (5083344).

Almost surely, 2^138157266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138157266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162667008).

138157266 is an abundant number, since it is smaller than the sum of its proper divisors (187176750).

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

138157266 is a wasteful number, since it uses less digits than its factorization.

138157266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3427.

The product of its digits is 60480, while the sum is 39.

The square root of 138157266 is about 11754.0319039894. The cubic root of 138157266 is about 516.9611539814.

The spelling of 138157266 in words is "one hundred thirty-eight million, one hundred fifty-seven thousand, two hundred sixty-six".