138766402 has 8 divisors (see below), whose sum is σ = 212077116. Its totient is φ = 68074032.

The previous prime is 138766387. The next prime is 138766403. The reversal of 138766402 is 204667831.

It can be written as a sum of positive squares in 2 ways, for example, as 128391561 + 10374841 = 11331^2 + 3221^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×138766402² = 38512228648051208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138766403) 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, 654453 + ... + 654664.

Almost surely, 2^138766402 is an apocalyptic number.

138766402 is a deficient number, since it is larger than the sum of its proper divisors (73310714).

138766402 is a wasteful number, since it uses less digits than its factorization.

138766402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309172.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 138766402 is about 11779.9151949409. The cubic root of 138766402 is about 517.7198014534.

The spelling of 138766402 in words is "one hundred thirty-eight million, seven hundred sixty-six thousand, four hundred two".