1949681394 has 32 divisors (see below), whose sum is σ = 4366755840. Its totient is φ = 644774256.

The previous prime is 1949681389. The next prime is 1949681417. The reversal of 1949681394 is 4931869491.

It is a happy number.

1949681394 is a `hidden beast` number, since 1 + 94 + 96 + 81 + 394 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1949681394.

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 15 ways as a sum of consecutive naturals, for example, 135289 + ... + 149004.

It is an arithmetic number, because the mean of its divisors is an integer number (136461120).

Almost surely, 2^1949681394 is an apocalyptic number.

1949681394 is an abundant number, since it is smaller than the sum of its proper divisors (2417074446).

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

1949681394 is a wasteful number, since it uses less digits than its factorization.

1949681394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284431 (or 284425 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 1949681394 is about 44155.1966817044. The cubic root of 1949681394 is about 1249.2649318779.

The spelling of 1949681394 in words is "one billion, nine hundred forty-nine million, six hundred eighty-one thousand, three hundred ninety-four".