1685280534 has 16 divisors (see below), whose sum is σ = 3852069888. Its totient is φ = 481508712.

The previous prime is 1685280521. The next prime is 1685280539. The reversal of 1685280534 is 4350825861.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 40125727 = 1685280534 / (1 + 6 + 8 + 5 + 2 + 8 + 0 + 5 + 3 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685280539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20062822 + ... + 20062905.

It is an arithmetic number, because the mean of its divisors is an integer number (240754368).

Almost surely, 2^1685280534 is an apocalyptic number.

1685280534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1685280534 is an abundant number, since it is smaller than the sum of its proper divisors (2166789354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1685280534 is a wasteful number, since it uses less digits than its factorization.

1685280534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40125739.

The product of its (nonzero) digits is 230400, while the sum is 42.

The square root of 1685280534 is about 41052.1684445536. The cubic root of 1685280534 is about 1190.0286069907.

The spelling of 1685280534 in words is "one billion, six hundred eighty-five million, two hundred eighty thousand, five hundred thirty-four".