1685438154 has 24 divisors (see below), whose sum is σ = 3652873380. Its totient is φ = 561644928.

The previous prime is 1685438129. The next prime is 1685438177. The reversal of 1685438154 is 4518345861.

1685438154 is a `hidden beast` number, since 1 + 68 + 5 + 438 + 154 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1445900625 + 239537529 = 38025^2 + 15477^2 .

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, 57964 + ... + 82040.

Almost surely, 2^1685438154 is an apocalyptic number.

1685438154 is an abundant number, since it is smaller than the sum of its proper divisors (1967435226).

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

1685438154 is a wasteful number, since it uses less digits than its factorization.

1685438154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27974 (or 27971 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The square root of 1685438154 is about 41054.0881520952. The cubic root of 1685438154 is about 1190.0657059499.

The spelling of 1685438154 in words is "one billion, six hundred eighty-five million, four hundred thirty-eight thousand, one hundred fifty-four".