1671644 has 48 divisors (see below), whose sum is σ = 3499776. Its totient is φ = 691200.

The previous prime is 1671643. The next prime is 1671671. The reversal of 1671644 is 4461761.

Its product of digits (4032) is a multiple of the sum of its prime factors (126).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671641) 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, 27374 + ... + 27434.

It is an arithmetic number, because the mean of its divisors is an integer number (72912).

2^1671644 is an apocalyptic number.

It is an amenable number.

1671644 is an abundant number, since it is smaller than the sum of its proper divisors (1828132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1671644 is a wasteful number, since it uses less digits than its factorization.

1671644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 124 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 1671644 is about 1292.9207245613. The cubic root of 1671644 is about 118.6810184777.

The spelling of 1671644 in words is "one million, six hundred seventy-one thousand, six hundred forty-four".