1660425 has 36 divisors (see below), whose sum is σ = 2995344. Its totient is φ = 811200.

The previous prime is 1660423. The next prime is 1660433. The reversal of 1660425 is 5240661.

It is not a de Polignac number, because 1660425 - 2¹ = 1660423 is a prime.

It is a super-2 number, since 2×1660425² = 5514022361250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1660395 and 1660404.

It is not an unprimeable number, because it can be changed into a prime (1660423) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12610 + ... + 12740.

It is an arithmetic number, because the mean of its divisors is an integer number (83204).

2^1660425 is an apocalyptic number.

1660425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1660425 is a deficient number, since it is larger than the sum of its proper divisors (1334919).

1660425 is a wasteful number, since it uses less digits than its factorization.

1660425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1660425 is about 1288.5747941039. The cubic root of 1660425 is about 118.4149187206.

The spelling of 1660425 in words is "one million, six hundred sixty thousand, four hundred twenty-five".