1685538340 has 24 divisors (see below), whose sum is σ = 3542277312. Its totient is φ = 673711200.

The previous prime is 1685538311. The next prime is 1685538343. The reversal of 1685538340 is 438355861.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1685538343) 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, 3486 + ... + 58165.

It is an arithmetic number, because the mean of its divisors is an integer number (147594888).

Almost surely, 2^1685538340 is an apocalyptic number.

1685538340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685538340 is an abundant number, since it is smaller than the sum of its proper divisors (1856738972).

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

1685538340 is a wasteful number, since it uses less digits than its factorization.

1685538340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63027 (or 63025 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 1685538340 is about 41055.3083047735. The cubic root of 1685538340 is about 1190.0892854882.

The spelling of 1685538340 in words is "one billion, six hundred eighty-five million, five hundred thirty-eight thousand, three hundred forty".