138626402 has 8 divisors (see below), whose sum is σ = 208129116. Its totient is φ = 69250032.

The previous prime is 138626401. The next prime is 138626419. The reversal of 138626402 is 204626831.

It can be written as a sum of positive squares in 2 ways, for example, as 120978001 + 17648401 = 10999^2 + 4201^2 .

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

It is not an unprimeable number, because it can be changed into a prime (138626401) 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, 28793 + ... + 33260.

Almost surely, 2^138626402 is an apocalyptic number.

138626402 is a deficient number, since it is larger than the sum of its proper divisors (69502714).

138626402 is a wasteful number, since it uses less digits than its factorization.

138626402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63172.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 138626402 is about 11773.9713775769. The cubic root of 138626402 is about 517.5456354693.

The spelling of 138626402 in words is "one hundred thirty-eight million, six hundred twenty-six thousand, four hundred two".