189090045 has 40 divisors (see below), whose sum is σ = 340072920. Its totient is φ = 100517760.

The previous prime is 189090043. The next prime is 189090047. The reversal of 189090045 is 540090981.

It is an interprime number because it is at equal distance from previous prime (189090043) and next prime (189090047).

It can be written as a sum of positive squares in 4 ways, for example, as 24147396 + 164942649 = 4914^2 + 12843^2 .

It is not a de Polignac number, because 189090045 - 2¹ = 189090043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 189089991 and 189090009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189090043) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 169951 + ... + 171059.

It is an arithmetic number, because the mean of its divisors is an integer number (8501823).

Almost surely, 2^189090045 is an apocalyptic number.

189090045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189090045 is a deficient number, since it is larger than the sum of its proper divisors (150982875).

189090045 is a wasteful number, since it uses less digits than its factorization.

189090045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547 (or 1538 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 189090045 is about 13751.0015998836. The cubic root of 189090045 is about 573.9704778691.

The spelling of 189090045 in words is "one hundred eighty-nine million, ninety thousand, forty-five".