189906540 has 48 divisors (see below), whose sum is σ = 539239680. Its totient is φ = 49927360.

The previous prime is 189906517. The next prime is 189906551. The reversal of 189906540 is 45609981.

It is a junction number, because it is equal to n+sod(n) for n = 189906492 and 189906501.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18030 + ... + 26549.

It is an arithmetic number, because the mean of its divisors is an integer number (11234160).

Almost surely, 2^189906540 is an apocalyptic number.

189906540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189906540 is an abundant number, since it is smaller than the sum of its proper divisors (349333140).

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

189906540 is a wasteful number, since it uses less digits than its factorization.

189906540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44662 (or 44660 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 189906540 is about 13780.6581845716. The cubic root of 189906540 is about 574.7954306941.

The spelling of 189906540 in words is "one hundred eighty-nine million, nine hundred six thousand, five hundred forty".