1685429398 has 4 divisors (see below), whose sum is σ = 2528144100. Its totient is φ = 842714698.

The previous prime is 1685429393. The next prime is 1685429399. The reversal of 1685429398 is 8939245861.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685429393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421357348 + ... + 421357351.

It is an arithmetic number, because the mean of its divisors is an integer number (632036025).

Almost surely, 2^1685429398 is an apocalyptic number.

1685429398 is a deficient number, since it is larger than the sum of its proper divisors (842714702).

1685429398 is an equidigital number, since it uses as much as digits as its factorization.

1685429398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842714701.

The product of its digits is 3732480, while the sum is 55.

The square root of 1685429398 is about 41053.9815121506. The cubic root of 1685429398 is about 1190.0636451142.

The spelling of 1685429398 in words is "one billion, six hundred eighty-five million, four hundred twenty-nine thousand, three hundred ninety-eight".