1947142871 has 8 divisors (see below), whose sum is σ = 2008075344. Its totient is φ = 1886647680.

The previous prime is 1947142843. The next prime is 1947142907. The reversal of 1947142871 is 1782417491.

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

It is a cyclic number.

It is not a de Polignac number, because 1947142871 - 2⁶ = 1947142807 is a prime.

It is a super-2 number, since 2×1947142871² = 7582730720172245282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1947142831) 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, 100265 + ... + 118098.

It is an arithmetic number, because the mean of its divisors is an integer number (251009418).

Almost surely, 2^1947142871 is an apocalyptic number.

1947142871 is a deficient number, since it is larger than the sum of its proper divisors (60932473).

1947142871 is a wasteful number, since it uses less digits than its factorization.

1947142871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218641.

The product of its digits is 112896, while the sum is 44.

The square root of 1947142871 is about 44126.4418574623. The cubic root of 1947142871 is about 1248.7225073348.

The spelling of 1947142871 in words is "one billion, nine hundred forty-seven million, one hundred forty-two thousand, eight hundred seventy-one".