389623940 has 12 divisors (see below), whose sum is σ = 818210316. Its totient is φ = 155849568.

The previous prime is 389623939. The next prime is 389623967. The reversal of 389623940 is 49326983.

It can be written as a sum of positive squares in 2 ways, for example, as 146700544 + 242923396 = 12112^2 + 15586^2 .

It is a super-2 number, since 2×389623940² = 303613629242247200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 389623891 and 389623900.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9740579 + ... + 9740618.

It is an arithmetic number, because the mean of its divisors is an integer number (68184193).

Almost surely, 2^389623940 is an apocalyptic number.

It is an amenable number.

389623940 is an abundant number, since it is smaller than the sum of its proper divisors (428586376).

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

389623940 is a wasteful number, since it uses less digits than its factorization.

389623940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19481206 (or 19481204 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 389623940 is about 19738.8940926284. The cubic root of 389623940 is about 730.3794486935.

The spelling of 389623940 in words is "three hundred eighty-nine million, six hundred twenty-three thousand, nine hundred forty".