1646402 has 4 divisors (see below), whose sum is σ = 2469606. Its totient is φ = 823200.

The previous prime is 1646387. The next prime is 1646413. The reversal of 1646402 is 2046461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2046461 = 647 ⋅3163.

It can be written as a sum of positive squares in only one way, i.e., 1366561 + 279841 = 1169^2 + 529^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411599 + ... + 411602.

2^1646402 is an apocalyptic number.

1646402 is a deficient number, since it is larger than the sum of its proper divisors (823204).

1646402 is an equidigital number, since it uses as much as digits as its factorization.

1646402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823203.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1646402 is about 1283.1219739370. The cubic root of 1646402 is about 118.0806209559.

It can be divided in two parts, 1646 and 402, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 1646402 in words is "one million, six hundred forty-six thousand, four hundred two".