138692451 has 8 divisors (see below), whose sum is σ = 186335424. Its totient is φ = 91755560.

The previous prime is 138692447. The next prime is 138692459. The reversal of 138692451 is 154296831.

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

It is a cyclic number.

It is not a de Polignac number, because 138692451 - 2² = 138692447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138692459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176061 + ... + 176846.

It is an arithmetic number, because the mean of its divisors is an integer number (23291928).

Almost surely, 2^138692451 is an apocalyptic number.

138692451 is a deficient number, since it is larger than the sum of its proper divisors (47642973).

138692451 is a wasteful number, since it uses less digits than its factorization.

138692451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353041.

The product of its digits is 51840, while the sum is 39.

The square root of 138692451 is about 11776.7759170326. The cubic root of 138692451 is about 517.6278178523.

The spelling of 138692451 in words is "one hundred thirty-eight million, six hundred ninety-two thousand, four hundred fifty-one".