138401895 has 8 divisors (see below), whose sum is σ = 221443056. Its totient is φ = 73814336.

The previous prime is 138401873. The next prime is 138401897. The reversal of 138401895 is 598104831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138401895 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138401897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4613382 + ... + 4613411.

It is an arithmetic number, because the mean of its divisors is an integer number (27680382).

Almost surely, 2^138401895 is an apocalyptic number.

138401895 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138401895 is a deficient number, since it is larger than the sum of its proper divisors (83041161).

138401895 is an equidigital number, since it uses as much as digits as its factorization.

138401895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9226801.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 138401895 is about 11764.4334755227. The cubic root of 138401895 is about 517.2660942037.

The spelling of 138401895 in words is "one hundred thirty-eight million, four hundred one thousand, eight hundred ninety-five".