306885840 has 160 divisors (see below), whose sum is σ = 985222656. Its totient is φ = 78973440.

The previous prime is 306885829. The next prime is 306885863. The reversal of 306885840 is 48588603.

It is a junction number, because it is equal to n+sod(n) for n = 306885792 and 306885801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1351807 + ... + 1352033.

Almost surely, 2^306885840 is an apocalyptic number.

306885840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 306885840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (492611328).

306885840 is an abundant number, since it is smaller than the sum of its proper divisors (678336816).

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

306885840 is a wasteful number, since it uses less digits than its factorization.

306885840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 306885840 is about 17518.1574373562. The cubic root of 306885840 is about 674.5160426730.

The spelling of 306885840 in words is "three hundred six million, eight hundred eighty-five thousand, eight hundred forty".