138442197 has 16 divisors (see below), whose sum is σ = 191434880. Its totient is φ = 88921152.

The previous prime is 138442163. The next prime is 138442217. The reversal of 138442197 is 791244831.

It is not a de Polignac number, because 138442197 - 2⁶ = 138442133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138442127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5379 + ... + 17487.

It is an arithmetic number, because the mean of its divisors is an integer number (11964680).

Almost surely, 2^138442197 is an apocalyptic number.

It is an amenable number.

138442197 is a deficient number, since it is larger than the sum of its proper divisors (52992683).

138442197 is a wasteful number, since it uses less digits than its factorization.

138442197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12252.

The product of its digits is 48384, while the sum is 39.

The square root of 138442197 is about 11766.1462255065. The cubic root of 138442197 is about 517.3162978394.

The spelling of 138442197 in words is "one hundred thirty-eight million, four hundred forty-two thousand, one hundred ninety-seven".