1986610225 has 12 divisors (see below), whose sum is σ = 2608302924. Its totient is φ = 1495800320.

The previous prime is 1986610217. The next prime is 1986610237. The reversal of 1986610225 is 5220166891.

It can be written as a sum of positive squares in 6 ways, for example, as 169208064 + 1817402161 = 13008^2 + 42631^2 .

It is not a de Polignac number, because 1986610225 - 2³ = 1986610217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2336764 + ... + 2337613.

It is an arithmetic number, because the mean of its divisors is an integer number (217358577).

Almost surely, 2^1986610225 is an apocalyptic number.

It is an amenable number.

1986610225 is a deficient number, since it is larger than the sum of its proper divisors (621692699).

1986610225 is a wasteful number, since it uses less digits than its factorization.

1986610225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4674404 (or 4674399 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 1986610225 is about 44571.4059123111. The cubic root of 1986610225 is about 1257.1030752704.

The spelling of 1986610225 in words is "one billion, nine hundred eighty-six million, six hundred ten thousand, two hundred twenty-five".