1917919970 has 16 divisors (see below), whose sum is σ = 3532541760. Its totient is φ = 749326704.

The previous prime is 1917919963. The next prime is 1917919979. The reversal of 1917919970 is 799197191.

It is a super-2 number, since 2×1917919970² = 7356834022649601800, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1917919979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2229710 + ... + 2230569.

It is an arithmetic number, because the mean of its divisors is an integer number (220783860).

Almost surely, 2^1917919970 is an apocalyptic number.

1917919970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1917919970 is a deficient number, since it is larger than the sum of its proper divisors (1614621790).

1917919970 is a wasteful number, since it uses less digits than its factorization.

1917919970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4460329.

The product of its (nonzero) digits is 321489, while the sum is 53.

The square root of 1917919970 is about 43794.0631821255. The cubic root of 1917919970 is about 1242.4440112580. Note that the first 3 decimals are identical.

The spelling of 1917919970 in words is "one billion, nine hundred seventeen million, nine hundred nineteen thousand, nine hundred seventy".