254187989 has 8 divisors (see below), whose sum is σ = 281996640. Its totient is φ = 227162800.

The previous prime is 254187977. The next prime is 254188009. The reversal of 254187989 is 989781452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 254187989 - 2²⁴ = 237410773 is a prime.

It is a super-2 number, since 2×254187989² = 129223067503728242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 254187989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (254187289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195182 + ... + 196479.

It is an arithmetic number, because the mean of its divisors is an integer number (35249580).

Almost surely, 2^254187989 is an apocalyptic number.

It is an amenable number.

254187989 is a deficient number, since it is larger than the sum of its proper divisors (27808651).

254187989 is a wasteful number, since it uses less digits than its factorization.

254187989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391731.

The product of its digits is 1451520, while the sum is 53.

The square root of 254187989 is about 15943.2740991303. The cubic root of 254187989 is about 633.4587533391.

The spelling of 254187989 in words is "two hundred fifty-four million, one hundred eighty-seven thousand, nine hundred eighty-nine".