1646428 has 24 divisors (see below), whose sum is σ = 3325952. Its totient is φ = 698544.

The previous prime is 1646423. The next prime is 1646443. The reversal of 1646428 is 8246461.

It is a self number, because there is not a number n which added to its sum of digits gives 1646428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3325 + ... + 3787.

2^1646428 is an apocalyptic number.

It is an amenable number.

1646428 is an abundant number, since it is smaller than the sum of its proper divisors (1679524).

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

1646428 is a wasteful number, since it uses less digits than its factorization.

1646428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601 (or 599 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 1646428 is about 1283.1321054358. The cubic root of 1646428 is about 118.0812425295.

The spelling of 1646428 in words is "one million, six hundred forty-six thousand, four hundred twenty-eight".