1947879645 has 16 divisors (see below), whose sum is σ = 3141150720. Its totient is φ = 1030688064.

The previous prime is 1947879643. The next prime is 1947879667. The reversal of 1947879645 is 5469787491.

It is not a de Polignac number, because 1947879645 - 2¹ = 1947879643 is a prime.

It is a super-2 number, since 2×1947879645² = 7588470222810652050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1947879643) 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, 509350 + ... + 513159.

It is an arithmetic number, because the mean of its divisors is an integer number (196321920).

Almost surely, 2^1947879645 is an apocalyptic number.

1947879645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1947879645 is a deficient number, since it is larger than the sum of its proper divisors (1193271075).

1947879645 is a wasteful number, since it uses less digits than its factorization.

1947879645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022644.

The product of its digits is 15240960, while the sum is 60.

The square root of 1947879645 is about 44134.7895089577. The cubic root of 1947879645 is about 1248.8799876910.

The spelling of 1947879645 in words is "one billion, nine hundred forty-seven million, eight hundred seventy-nine thousand, six hundred forty-five".