389203890 has 16 divisors (see below), whose sum is σ = 934089408. Its totient is φ = 103787696.

The previous prime is 389203883. The next prime is 389203901. The reversal of 389203890 is 98302983.

It is a super-2 number, since 2×389203890² = 302959335982264200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6486702 + ... + 6486761.

It is an arithmetic number, because the mean of its divisors is an integer number (58380588).

Almost surely, 2^389203890 is an apocalyptic number.

389203890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

389203890 is an abundant number, since it is smaller than the sum of its proper divisors (544885518).

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

389203890 is a wasteful number, since it uses less digits than its factorization.

389203890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12973473.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 389203890 is about 19728.2510628793. The cubic root of 389203890 is about 730.1168825168.

It can be divided in two parts, 389203 and 890, that added together give a palindrome (390093).

The spelling of 389203890 in words is "three hundred eighty-nine million, two hundred three thousand, eight hundred ninety".