1671720 has 32 divisors (see below), whose sum is σ = 5015520. Its totient is φ = 445760.

The previous prime is 1671713. The next prime is 1671727. The reversal of 1671720 is 271761.

It is an interprime number because it is at equal distance from previous prime (1671713) and next prime (1671727).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1671727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6846 + ... + 7085.

It is an arithmetic number, because the mean of its divisors is an integer number (156735).

2^1671720 is an apocalyptic number.

1671720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1671720 is an abundant number, since it is smaller than the sum of its proper divisors (3343800).

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

1671720 is a wasteful number, since it uses less digits than its factorization.

1671720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13945 (or 13941 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 1671720 is about 1292.9501150470. The cubic root of 1671720 is about 118.6828170306.

The spelling of 1671720 in words is "one million, six hundred seventy-one thousand, seven hundred twenty".