389491380 has 54 divisors (see below), whose sum is σ = 1182260898. Its totient is φ = 103793760.

The previous prime is 389491379. The next prime is 389491387. The reversal of 389491380 is 83194983.

389491380 is a `hidden beast` number, since 3 + 89 + 491 + 3 + 80 = 666.

It can be written as a sum of positive squares in only one way, i.e., 311593104 + 77898276 = 17652^2 + 8826^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389491387) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 264045 + ... + 265515.

Almost surely, 2^389491380 is an apocalyptic number.

389491380 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

389491380 is an abundant number, since it is smaller than the sum of its proper divisors (792769518).

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

389491380 is a wasteful number, since it uses less digits than its factorization.

389491380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2957 (or 1481 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 389491380 is about 19735.5359694131. The cubic root of 389491380 is about 730.2966080601.

Multiplying 389491380 by its sum of digits (45), we get a square (17527112100 = 132390²).

389491380 divided by its sum of digits (45) gives a square (8655364 = 2942²).

The spelling of 389491380 in words is "three hundred eighty-nine million, four hundred ninety-one thousand, three hundred eighty".