1947680385 has 32 divisors (see below), whose sum is σ = 3564503040. Its totient is φ = 889610688.

The previous prime is 1947680381. The next prime is 1947680387. The reversal of 1947680385 is 5830867491.

It is not a de Polignac number, because 1947680385 - 2² = 1947680381 is a prime.

It is a super-2 number, since 2×1947680385² = 7586917764227496450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1947680381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127044 + ... + 141546.

It is an arithmetic number, because the mean of its divisors is an integer number (111390720).

Almost surely, 2^1947680385 is an apocalyptic number.

1947680385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1947680385 is a deficient number, since it is larger than the sum of its proper divisors (1616822655).

1947680385 is a wasteful number, since it uses less digits than its factorization.

1947680385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15797.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The square root of 1947680385 is about 44132.5320483654. The cubic root of 1947680385 is about 1248.8374011597.

The spelling of 1947680385 in words is "one billion, nine hundred forty-seven million, six hundred eighty thousand, three hundred eighty-five".