1671749 has 4 divisors (see below), whose sum is σ = 1674336. Its totient is φ = 1669164.

The previous prime is 1671739. The next prime is 1671757. The reversal of 1671749 is 9471761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1671749 - 2⁸ = 1671493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 632 + ... + 1934.

It is an arithmetic number, because the mean of its divisors is an integer number (418584).

2^1671749 is an apocalyptic number.

It is an amenable number.

1671749 is a deficient number, since it is larger than the sum of its proper divisors (2587).

1671749 is a wasteful number, since it uses less digits than its factorization.

1671749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2586.

The product of its digits is 10584, while the sum is 35.

The square root of 1671749 is about 1292.9613296615. The cubic root of 1671749 is about 118.6835033062.

The spelling of 1671749 in words is "one million, six hundred seventy-one thousand, seven hundred forty-nine".