1913187642 has 16 divisors (see below), whose sum is σ = 3829203072. Its totient is φ = 637257920.

The previous prime is 1913187607. The next prime is 1913187649. The reversal of 1913187642 is 2467813191.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1913187594 and 1913187603.

It is not an unprimeable number, because it can be changed into a prime (1913187649) 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, 108978 + ... + 125309.

It is an arithmetic number, because the mean of its divisors is an integer number (239325192).

Almost surely, 2^1913187642 is an apocalyptic number.

1913187642 is an abundant number, since it is smaller than the sum of its proper divisors (1916015430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1913187642 is a wasteful number, since it uses less digits than its factorization.

1913187642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235653.

The product of its digits is 72576, while the sum is 42.

The square root of 1913187642 is about 43740.0004801097. Note that the first 3 decimals coincide. The cubic root of 1913187642 is about 1241.4212895618.

Subtracting from 1913187642 its sum of digits (42), we obtain a square (1913187600 = 43740²).

The spelling of 1913187642 in words is "one billion, nine hundred thirteen million, one hundred eighty-seven thousand, six hundred forty-two".