309213426540 has 24 divisors (see below), whose sum is σ = 865797594480. Its totient is φ = 82456913728.

The previous prime is 309213426497. The next prime is 309213426617. The reversal of 309213426540 is 45624312903.

It is a super-2 number, since 2×309213426540² (a number of 24 digits) contains 22 as substring.

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, 2576778495 + ... + 2576778614.

It is an arithmetic number, because the mean of its divisors is an integer number (36074899770).

Almost surely, 2^309213426540 is an apocalyptic number.

309213426540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

309213426540 is an abundant number, since it is smaller than the sum of its proper divisors (556584167940).

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

309213426540 is a wasteful number, since it uses less digits than its factorization.

309213426540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5153557121 (or 5153557119 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The spelling of 309213426540 in words is "three hundred nine billion, two hundred thirteen million, four hundred twenty-six thousand, five hundred forty".