1685271240 has 48 divisors (see below), whose sum is σ = 5477132700. Its totient is φ = 449405568.

The previous prime is 1685271209. The next prime is 1685271277. The reversal of 1685271240 is 421725861.

1685271240 is a `hidden beast` number, since 1 + 6 + 8 + 527 + 124 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1680836004 + 4435236 = 40998^2 + 2106^2 .

It is a super-2 number, since 2×1685271240² = 5680278304742275200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1685271195 and 1685271204.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2340295 + ... + 2341014.

Almost surely, 2^1685271240 is an apocalyptic number.

1685271240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685271240 is an abundant number, since it is smaller than the sum of its proper divisors (3791861460).

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

1685271240 is a wasteful number, since it uses less digits than its factorization.

1685271240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4681326 (or 4681319 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 1685271240 is about 41052.0552469666. The cubic root of 1685271240 is about 1190.0264193932.

The spelling of 1685271240 in words is "one billion, six hundred eighty-five million, two hundred seventy-one thousand, two hundred forty".