1987625 has 8 divisors (see below), whose sum is σ = 2480712. Its totient is φ = 1590000.

The previous prime is 1987621. The next prime is 1987649. The reversal of 1987625 is 5267891.

It can be written as a sum of positive squares in 4 ways, for example, as 38809 + 1948816 = 197^2 + 1396^2 .

It is not a de Polignac number, because 1987625 - 2² = 1987621 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987621) 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, 7826 + ... + 8075.

It is an arithmetic number, because the mean of its divisors is an integer number (310089).

2^1987625 is an apocalyptic number.

It is an amenable number.

1987625 is a deficient number, since it is larger than the sum of its proper divisors (493087).

1987625 is an equidigital number, since it uses as much as digits as its factorization.

1987625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15916 (or 15906 counting only the distinct ones).

The product of its digits is 30240, while the sum is 38.

The square root of 1987625 is about 1409.8315502215. The cubic root of 1987625 is about 125.7317084644.

The spelling of 1987625 in words is "one million, nine hundred eighty-seven thousand, six hundred twenty-five".