389749806 has 20 divisors (see below), whose sum is σ = 873328632. Its totient is φ = 129916548.

The previous prime is 389749799. The next prime is 389749817. The reversal of 389749806 is 608947983.

It is a super-2 number, since 2×389749806² = 303809822554075272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1202770 + ... + 1203093.

Almost surely, 2^389749806 is an apocalyptic number.

389749806 is an abundant number, since it is smaller than the sum of its proper divisors (483578826).

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

389749806 is a wasteful number, since it uses less digits than its factorization.

389749806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2405877 (or 2405868 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 389749806 is about 19742.0821090380. The cubic root of 389749806 is about 730.4580886613.

The spelling of 389749806 in words is "three hundred eighty-nine million, seven hundred forty-nine thousand, eight hundred six".