1671945 has 16 divisors (see below), whose sum is σ = 2918592. Its totient is φ = 810560.

The previous prime is 1671941. The next prime is 1671947. The reversal of 1671945 is 5491761.

It is not a de Polignac number, because 1671945 - 2² = 1671941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

1671945 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1671941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4902 + ... + 5231.

It is an arithmetic number, because the mean of its divisors is an integer number (182412).

2^1671945 is an apocalyptic number.

1671945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1671945 is a deficient number, since it is larger than the sum of its proper divisors (1246647).

1671945 is a wasteful number, since it uses less digits than its factorization.

1671945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10152.

The product of its digits is 7560, while the sum is 33.

The square root of 1671945 is about 1293.0371224369. The cubic root of 1671945 is about 118.6881413744.

It can be divided in two parts, 167 and 1945, that added together give a palindrome (2112).

The spelling of 1671945 in words is "one million, six hundred seventy-one thousand, nine hundred forty-five".