138802001 has 4 divisors (see below), whose sum is σ = 149479092. Its totient is φ = 128124912.

The previous prime is 138801953. The next prime is 138802003. The reversal of 138802001 is 100208831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49688401 + 89113600 = 7049^2 + 9440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138802001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138802003) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5338526 + ... + 5338551.

It is an arithmetic number, because the mean of its divisors is an integer number (37369773).

Almost surely, 2^138802001 is an apocalyptic number.

It is an amenable number.

138802001 is a deficient number, since it is larger than the sum of its proper divisors (10677091).

138802001 is a wasteful number, since it uses less digits than its factorization.

138802001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10677090.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 138802001 is about 11781.4261021321. The cubic root of 138802001 is about 517.7640694490.

The spelling of 138802001 in words is "one hundred thirty-eight million, eight hundred two thousand, one".