1947375138 has 8 divisors (see below), whose sum is σ = 3894750288. Its totient is φ = 649125044.

The previous prime is 1947375137. The next prime is 1947375161. The reversal of 1947375138 is 8315737491.

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

1947375138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1947375137) 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, 162281256 + ... + 162281267.

It is an arithmetic number, because the mean of its divisors is an integer number (486843786).

Almost surely, 2^1947375138 is an apocalyptic number.

1947375138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1947375138 is a wasteful number, since it uses less digits than its factorization.

1947375138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324562528.

The product of its digits is 635040, while the sum is 48.

The square root of 1947375138 is about 44129.0736136620. The cubic root of 1947375138 is about 1248.7721570897.

The spelling of 1947375138 in words is "one billion, nine hundred forty-seven million, three hundred seventy-five thousand, one hundred thirty-eight".