309980540 has 12 divisors (see below), whose sum is σ = 650959176. Its totient is φ = 123992208.

The previous prime is 309980521. The next prime is 309980543. The reversal of 309980540 is 45089903.

It is a junction number, because it is equal to n+sod(n) for n = 309980494 and 309980503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309980543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7749494 + ... + 7749533.

It is an arithmetic number, because the mean of its divisors is an integer number (54246598).

Almost surely, 2^309980540 is an apocalyptic number.

It is an amenable number.

309980540 is an abundant number, since it is smaller than the sum of its proper divisors (340978636).

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

309980540 is a wasteful number, since it uses less digits than its factorization.

309980540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15499036 (or 15499034 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 309980540 is about 17606.2642261213. The cubic root of 309980540 is about 676.7757832667.

The spelling of 309980540 in words is "three hundred nine million, nine hundred eighty thousand, five hundred forty".