305442840 has 32 divisors (see below), whose sum is σ = 916328880. Its totient is φ = 81451392.

The previous prime is 305442827. The next prime is 305442857. The reversal of 305442840 is 48244503.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 305442798 and 305442807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1272559 + ... + 1272798.

Almost surely, 2^305442840 is an apocalyptic number.

305442840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

305442840 is an abundant number, since it is smaller than the sum of its proper divisors (610886040).

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

305442840 is a wasteful number, since it uses less digits than its factorization.

305442840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545371 (or 2545367 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

The square root of 305442840 is about 17476.9230701517. The cubic root of 305442840 is about 673.4571731395.

The spelling of 305442840 in words is "three hundred five million, four hundred forty-two thousand, eight hundred forty".