190909489 has 9 divisors (see below), whose sum is σ = 196261761. Its totient is φ = 185700480.

The previous prime is 190909487. The next prime is 190909513. The reversal of 190909489 is 984909091.

The square root of 190909489 is 13817.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 98903025 + 92006464 = 9945^2 + 9592^2 .

It is not a de Polignac number, because 190909489 - 2¹ = 190909487 is a prime.

It is a super-2 number, since 2×190909489² = 72892865980482242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190909487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 566329 + ... + 566665.

Almost surely, 2^190909489 is an apocalyptic number.

190909489 is the 13817-th square number.

190909489 is the 6909-th centered octagonal number.

It is an amenable number.

190909489 is a deficient number, since it is larger than the sum of its proper divisors (5352272).

190909489 is an frugal number, since it uses more digits than its factorization.

190909489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 49.

The cubic root of 190909489 is about 575.8055391419.

Multiplying 190909489 by its sum of digits (49), we get a square (9354564961 = 96719²).

The spelling of 190909489 in words is "one hundred ninety million, nine hundred nine thousand, four hundred eighty-nine".