1646490 has 32 divisors (see below), whose sum is σ = 4012416. Its totient is φ = 432320.

The previous prime is 1646479. The next prime is 1646497. The reversal of 1646490 is 946461.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1646497) 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, 1744 + ... + 2516.

It is an arithmetic number, because the mean of its divisors is an integer number (125388).

2^1646490 is an apocalyptic number.

1646490 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 1646490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2006208).

1646490 is an abundant number, since it is smaller than the sum of its proper divisors (2365926).

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

1646490 is a wasteful number, since it uses less digits than its factorization.

1646490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1646490 is about 1283.1562648407. The cubic root of 1646490 is about 118.0827247170.

The spelling of 1646490 in words is "one million, six hundred forty-six thousand, four hundred ninety".