303399720 has 192 divisors, whose sum is σ = 1070269200. Its totient is φ = 74096640.

The previous prime is 303399673. The next prime is 303399721. The reversal of 303399720 is 27993303.

It can be written as a sum of positive squares in 8 ways, for example, as 43480836 + 259918884 = 6594^2 + 16122^2 .

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

It is not an unprimeable number, because it can be changed into a prime (303399721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1127746 + ... + 1128014.

Almost surely, 2^303399720 is an apocalyptic number.

303399720 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 303399720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (535134600).

303399720 is an abundant number, since it is smaller than the sum of its proper divisors (766869480).

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

303399720 is a wasteful number, since it uses less digits than its factorization.

303399720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540 (or 533 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 36.

The square root of 303399720 is about 17418.3730583542. The cubic root of 303399720 is about 671.9522181162.

The spelling of 303399720 in words is "three hundred three million, three hundred ninety-nine thousand, seven hundred twenty".