1671145 has 24 divisors (see below), whose sum is σ = 2462400. Its totient is φ = 1082592.

The previous prime is 1671139. The next prime is 1671161. The reversal of 1671145 is 5411761.

It is a happy number.

It is not a de Polignac number, because 1671145 - 2⁹ = 1670633 is a prime.

It is a super-2 number, since 2×1671145² = 5585451222050, which contains 22 as substring.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4476 + ... + 4834.

It is an arithmetic number, because the mean of its divisors is an integer number (102600).

2^1671145 is an apocalyptic number.

It is an amenable number.

1671145 is a deficient number, since it is larger than the sum of its proper divisors (791255).

1671145 is a wasteful number, since it uses less digits than its factorization.

1671145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 390 counting only the distinct ones).

The product of its digits is 840, while the sum is 25.

The square root of 1671145 is about 1292.7277362229. The cubic root of 1671145 is about 118.6692082035.

The spelling of 1671145 in words is "one million, six hundred seventy-one thousand, one hundred forty-five".