1691708438 has 12 divisors (see below), whose sum is σ = 2951858772. Its totient is φ = 725017860.

The previous prime is 1691708419. The next prime is 1691708461. The reversal of 1691708438 is 8348071961.

It is a junction number, because it is equal to n+sod(n) for n = 1691708392 and 1691708401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8631068 + ... + 8631263.

It is an arithmetic number, because the mean of its divisors is an integer number (245988231).

Almost surely, 2^1691708438 is an apocalyptic number.

1691708438 is a deficient number, since it is larger than the sum of its proper divisors (1260150334).

1691708438 is a wasteful number, since it uses less digits than its factorization.

1691708438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17262347 (or 17262340 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 1691708438 is about 41130.3833923293. The cubic root of 1691708438 is about 1191.5396679586.

The spelling of 1691708438 in words is "one billion, six hundred ninety-one million, seven hundred eight thousand, four hundred thirty-eight".