187484989 has 6 divisors (see below), whose sum is σ = 197872350. Its totient is φ = 177617016.

The previous prime is 187484981. The next prime is 187485017. The reversal of 187484989 is 989484781.

It can be written as a sum of positive squares in only one way, i.e., 122279364 + 65205625 = 11058^2 + 8075^2 .

It is not a de Polignac number, because 187484989 - 2³ = 187484981 is a prime.

It is a super-2 number, since 2×187484989² = 70301242200660242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187484981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 259314 + ... + 260035.

It is an arithmetic number, because the mean of its divisors is an integer number (32978725).

Almost surely, 2^187484989 is an apocalyptic number.

187484989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

187484989 is a deficient number, since it is larger than the sum of its proper divisors (10387361).

187484989 is an equidigital number, since it uses as much as digits as its factorization.

187484989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519387 (or 519368 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 58.

The square root of 187484989 is about 13692.5158024375. The cubic root of 187484989 is about 572.3418468197.

The spelling of 187484989 in words is "one hundred eighty-seven million, four hundred eighty-four thousand, nine hundred eighty-nine".