138661262 has 16 divisors (see below), whose sum is σ = 214637472. Its totient is φ = 67140480.

The previous prime is 138661247. The next prime is 138661279. The reversal of 138661262 is 262166831.

138661262 = 204² + 205² + ... + 751².

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5063 + ... + 17405.

It is an arithmetic number, because the mean of its divisors is an integer number (13414842).

Almost surely, 2^138661262 is an apocalyptic number.

138661262 is a deficient number, since it is larger than the sum of its proper divisors (75976210).

138661262 is a wasteful number, since it uses less digits than its factorization.

138661262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12523.

The product of its digits is 20736, while the sum is 35.

The square root of 138661262 is about 11775.4516686198. The cubic root of 138661262 is about 517.5890137592.

The spelling of 138661262 in words is "one hundred thirty-eight million, six hundred sixty-one thousand, two hundred sixty-two".