1861625 has 16 divisors (see below), whose sum is σ = 2375568. Its totient is φ = 1456000.

The previous prime is 1861621. The next prime is 1861631. The reversal of 1861625 is 5261681.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 284089 + 1577536 = 533^2 + 1256^2 .

It is not a de Polignac number, because 1861625 - 2² = 1861621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6485 + ... + 6765.

It is an arithmetic number, because the mean of its divisors is an integer number (148473).

2^1861625 is an apocalyptic number.

It is an amenable number.

1861625 is a deficient number, since it is larger than the sum of its proper divisors (513943).

1861625 is an equidigital number, since it uses as much as digits as its factorization.

1861625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 339 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 1861625 is about 1364.4137935392. The cubic root of 1861625 is about 123.0166985503.

The spelling of 1861625 in words is "one million, eight hundred sixty-one thousand, six hundred twenty-five".