1659945 has 16 divisors (see below), whose sum is σ = 3035520. Its totient is φ = 758784.

The previous prime is 1659919. The next prime is 1659971. The reversal of 1659945 is 5499561.

It is an interprime number because it is at equal distance from previous prime (1659919) and next prime (1659971).

It is not a de Polignac number, because 1659945 - 2⁵ = 1659913 is a prime.

1659945 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7800 + ... + 8009.

It is an arithmetic number, because the mean of its divisors is an integer number (189720).

2^1659945 is an apocalyptic number.

1659945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1659945 is a deficient number, since it is larger than the sum of its proper divisors (1375575).

1659945 is a wasteful number, since it uses less digits than its factorization.

1659945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15824.

The product of its digits is 48600, while the sum is 39.

The square root of 1659945 is about 1288.3885283563. The cubic root of 1659945 is about 118.4035070562.

The spelling of 1659945 in words is "one million, six hundred fifty-nine thousand, nine hundred forty-five".