309438893690 has 32 divisors (see below), whose sum is σ = 573531625296. Its totient is φ = 120130928640.

The previous prime is 309438893681. The next prime is 309438893711. The reversal of 309438893690 is 96398834903.

It can be written as a sum of positive squares in 8 ways, for example, as 8506557361 + 300932336329 = 92231^2 + 548573^2 .

It is a super-2 number, since 2×309438893690² (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 15 ways as a sum of consecutive naturals, for example, 1876127 + ... + 2034386.

Almost surely, 2^309438893690 is an apocalyptic number.

309438893690 is a deficient number, since it is larger than the sum of its proper divisors (264092731606).

309438893690 is a wasteful number, since it uses less digits than its factorization.

309438893690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3910754.

The product of its (nonzero) digits is 30233088, while the sum is 62.

The spelling of 309438893690 in words is "three hundred nine billion, four hundred thirty-eight million, eight hundred ninety-three thousand, six hundred ninety".