1671390 has 72 divisors (see below), whose sum is σ = 5068440. Its totient is φ = 381024.

The previous prime is 1671379. The next prime is 1671421. The reversal of 1671390 is 931761.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4221 + ... + 4599.

It is an arithmetic number, because the mean of its divisors is an integer number (70395).

2^1671390 is an apocalyptic number.

1671390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1671390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2534220).

1671390 is an abundant number, since it is smaller than the sum of its proper divisors (3397050).

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

1671390 is a wasteful number, since it uses less digits than its factorization.

1671390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 1671390 is about 1292.8224936162. The cubic root of 1671390 is about 118.6750071289.

The spelling of 1671390 in words is "one million, six hundred seventy-one thousand, three hundred ninety".