1913782905 has 24 divisors (see below), whose sum is σ = 3512355912. Its totient is φ = 960643584.

The previous prime is 1913782903. The next prime is 1913782907. The reversal of 1913782905 is 5092873191.

1913782905 is a `hidden beast` number, since 191 + 378 + 2 + 90 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1913782903) and next prime (1913782907).

It can be written as a sum of positive squares in 4 ways, for example, as 1048011129 + 865771776 = 32373^2 + 29424^2 .

It is not a de Polignac number, because 1913782905 - 2¹ = 1913782903 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1913782903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1250074 + ... + 1251603.

It is an arithmetic number, because the mean of its divisors is an integer number (146348163).

Almost surely, 2^1913782905 is an apocalyptic number.

1913782905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1913782905 is a deficient number, since it is larger than the sum of its proper divisors (1598573007).

1913782905 is a wasteful number, since it uses less digits than its factorization.

1913782905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2501705 (or 2501702 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 1913782905 is about 43746.8045118726. The cubic root of 1913782905 is about 1241.5500268095.

The spelling of 1913782905 in words is "one billion, nine hundred thirteen million, seven hundred eighty-two thousand, nine hundred five".