308687940 has 108 divisors (see below), whose sum is σ = 1029287532. Its totient is φ = 74828160.

The previous prime is 308687917. The next prime is 308688043. The reversal of 308687940 is 49786803.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 195776064 + 112911876 = 13992^2 + 10626^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14694 + ... + 28866.

Almost surely, 2^308687940 is an apocalyptic number.

308687940 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 308687940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (514643766).

308687940 is an abundant number, since it is smaller than the sum of its proper divisors (720599592).

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

308687940 is a wasteful number, since it uses less digits than its factorization.

308687940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14210 (or 14194 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 308687940 is about 17569.5173525057. The cubic root of 308687940 is about 675.8337680496.

The spelling of 308687940 in words is "three hundred eight million, six hundred eighty-seven thousand, nine hundred forty".