1681969839 has 16 divisors (see below), whose sum is σ = 2465771520. Its totient is φ = 1011346560.

The previous prime is 1681969801. The next prime is 1681969843. The reversal of 1681969839 is 9389691861.

It is not a de Polignac number, because 1681969839 - 2⁷ = 1681969711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681969879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196474 + ... + 204855.

It is an arithmetic number, because the mean of its divisors is an integer number (154110720).

Almost surely, 2^1681969839 is an apocalyptic number.

1681969839 is a deficient number, since it is larger than the sum of its proper divisors (783801681).

1681969839 is a wasteful number, since it uses less digits than its factorization.

1681969839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401470.

The product of its digits is 5038848, while the sum is 60.

The square root of 1681969839 is about 41011.8255994536. The cubic root of 1681969839 is about 1189.2488348409.

The spelling of 1681969839 in words is "one billion, six hundred eighty-one million, nine hundred sixty-nine thousand, eight hundred thirty-nine".