1660465 has 8 divisors (see below), whose sum is σ = 2000808. Its totient is φ = 1322880.

The previous prime is 1660457. The next prime is 1660469. The reversal of 1660465 is 5640661.

It can be written as a sum of positive squares in 4 ways, for example, as 4096 + 1656369 = 64^2 + 1287^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1660465 - 2³ = 1660457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1660469) 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, 1035 + ... + 2095.

It is an arithmetic number, because the mean of its divisors is an integer number (250101).

2^1660465 is an apocalyptic number.

It is an amenable number.

1660465 is a deficient number, since it is larger than the sum of its proper divisors (340343).

1660465 is a wasteful number, since it uses less digits than its factorization.

1660465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1660465 is about 1288.5903150342. The cubic root of 1660465 is about 118.4158695934.

The spelling of 1660465 in words is "one million, six hundred sixty thousand, four hundred sixty-five".