1685634099 has 16 divisors (see below), whose sum is σ = 2435064192. Its totient is φ = 1033054848.

The previous prime is 1685634091. The next prime is 1685634109. The reversal of 1685634099 is 9904365861.

It is not a de Polignac number, because 1685634099 - 2³ = 1685634091 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (1685634091) 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, 382129 + ... + 386514.

It is an arithmetic number, because the mean of its divisors is an integer number (152191512).

Almost surely, 2^1685634099 is an apocalyptic number.

1685634099 is a deficient number, since it is larger than the sum of its proper divisors (749430093).

1685634099 is a wasteful number, since it uses less digits than its factorization.

1685634099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768706.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 1685634099 is about 41056.4745076827. The cubic root of 1685634099 is about 1190.1118222250. Note that the first 3 decimals are identical.

The spelling of 1685634099 in words is "one billion, six hundred eighty-five million, six hundred thirty-four thousand, ninety-nine".