1684647442 has 8 divisors (see below), whose sum is σ = 2588604732. Its totient is φ = 821779200.

The previous prime is 1684647383. The next prime is 1684647451. The reversal of 1684647442 is 2447464861.

It can be written as a sum of positive squares in 2 ways, for example, as 1374852241 + 309795201 = 37079^2 + 17601^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1684647392 and 1684647401.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10272159 + ... + 10272322.

Almost surely, 2^1684647442 is an apocalyptic number.

1684647442 is a deficient number, since it is larger than the sum of its proper divisors (903957290).

1684647442 is a wasteful number, since it uses less digits than its factorization.

1684647442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20544524.

The product of its digits is 1032192, while the sum is 46.

The square root of 1684647442 is about 41044.4568973692. The cubic root of 1684647442 is about 1189.8795730592.

The spelling of 1684647442 in words is "one billion, six hundred eighty-four million, six hundred forty-seven thousand, four hundred forty-two".