307989381 has 16 divisors (see below), whose sum is σ = 477273600. Its totient is φ = 173010288.

The previous prime is 307989379. The next prime is 307989397. The reversal of 307989381 is 183989703.

It is not a de Polignac number, because 307989381 - 2¹ = 307989379 is a prime.

It is a super-2 number, since 2×307989381² = 189714917617526322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 307989381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (307989361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123051 + ... + 125528.

It is an arithmetic number, because the mean of its divisors is an integer number (29829600).

Almost surely, 2^307989381 is an apocalyptic number.

It is an amenable number.

307989381 is a deficient number, since it is larger than the sum of its proper divisors (169284219).

307989381 is a wasteful number, since it uses less digits than its factorization.

307989381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248648.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 307989381 is about 17549.6262353362. The cubic root of 307989381 is about 675.3235803859.

The spelling of 307989381 in words is "three hundred seven million, nine hundred eighty-nine thousand, three hundred eighty-one".