1909538694 has 24 divisors (see below), whose sum is σ = 4728381840. Its totient is φ = 545582448.

The previous prime is 1909538671. The next prime is 1909538747. The reversal of 1909538694 is 4968359091.

1909538694 is a `hidden beast` number, since 1 + 90 + 95 + 386 + 94 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1909538694.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7577409 + ... + 7577660.

It is an arithmetic number, because the mean of its divisors is an integer number (197015910).

Almost surely, 2^1909538694 is an apocalyptic number.

1909538694 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1909538694 is an abundant number, since it is smaller than the sum of its proper divisors (2818843146).

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

1909538694 is a wasteful number, since it uses less digits than its factorization.

1909538694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15155084 (or 15155081 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The square root of 1909538694 is about 43698.2687757765. The cubic root of 1909538694 is about 1240.6315491697.

The spelling of 1909538694 in words is "one billion, nine hundred nine million, five hundred thirty-eight thousand, six hundred ninety-four".