289919890 has 16 divisors (see below), whose sum is σ = 561998808. Its totient is φ = 107047296.

The previous prime is 289919869. The next prime is 289919933. The reversal of 289919890 is 98919982.

It can be written as a sum of positive squares in 4 ways, for example, as 207273609 + 82646281 = 14397^2 + 9091^2 .

It is a super-2 number, since 2×289919890² = 168107085235224200, 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, 1114947 + ... + 1115206.

Almost surely, 2^289919890 is an apocalyptic number.

289919890 is a deficient number, since it is larger than the sum of its proper divisors (272078918).

289919890 is a wasteful number, since it uses less digits than its factorization.

289919890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230173.

The product of its (nonzero) digits is 839808, while the sum is 55.

The square root of 289919890 is about 17027.0340928771. The cubic root of 289919890 is about 661.8496401577.

The spelling of 289919890 in words is "two hundred eighty-nine million, nine hundred nineteen thousand, eight hundred ninety".