138195023402 has 8 divisors (see below), whose sum is σ = 207294320676. Its totient is φ = 69096916512.

The previous prime is 138195023401. The next prime is 138195023431. The reversal of 138195023402 is 204320591831.

It can be written as a sum of positive squares in 2 ways, for example, as 109674231241 + 28520792161 = 331171^2 + 168881^2 .

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 (138195023401) 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, 97598 + ... + 534710.

Almost surely, 2^138195023402 is an apocalyptic number.

138195023402 is a deficient number, since it is larger than the sum of its proper divisors (69099297274).

138195023402 is a wasteful number, since it uses less digits than its factorization.

138195023402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595192.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 138195023402 in words is "one hundred thirty-eight billion, one hundred ninety-five million, twenty-three thousand, four hundred two".