1947142899 has 48 divisors (see below), whose sum is σ = 3137342208. Its totient is φ = 1156026816.

The previous prime is 1947142843. The next prime is 1947142907. The reversal of 1947142899 is 9982417491.

It is not a de Polignac number, because 1947142899 - 2¹² = 1947138803 is a prime.

It is a super-2 number, since 2×1947142899² = 7582730938252248402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1947142199) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 415242 + ... + 419904.

It is an arithmetic number, because the mean of its divisors is an integer number (65361296).

Almost surely, 2^1947142899 is an apocalyptic number.

1947142899 is a deficient number, since it is larger than the sum of its proper divisors (1190199309).

1947142899 is a wasteful number, since it uses less digits than its factorization.

1947142899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4808 (or 4805 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 1947142899 is about 44126.4421747324. The cubic root of 1947142899 is about 1248.7225133203.

The spelling of 1947142899 in words is "one billion, nine hundred forty-seven million, one hundred forty-two thousand, eight hundred ninety-nine".