309673447542 has 20 divisors (see below), whose sum is σ = 693897910596. Its totient is φ = 103224482460.

The previous prime is 309673447541. The next prime is 309673447543. The reversal of 309673447542 is 245744376903.

It is a happy number.

309673447542 is a `hidden beast` number, since 3 + 0 + 9 + 67 + 34 + 4 + 7 + 542 = 666.

It is an interprime number because it is at equal distance from previous prime (309673447541) and next prime (309673447543).

It is a super-2 number, since 2×309673447542² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309673447541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 955782084 + ... + 955782407.

Almost surely, 2^309673447542 is an apocalyptic number.

309673447542 is an abundant number, since it is smaller than the sum of its proper divisors (384224463054).

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

309673447542 is a wasteful number, since it uses less digits than its factorization.

309673447542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911564505 (or 1911564496 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 54.

The spelling of 309673447542 in words is "three hundred nine billion, six hundred seventy-three million, four hundred forty-seven thousand, five hundred forty-two".