1643354 has 4 divisors (see below), whose sum is σ = 2465034. Its totient is φ = 821676.

The previous prime is 1643351. The next prime is 1643357. The reversal of 1643354 is 4533461.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1643351) and next prime (1643357).

It can be written as a sum of positive squares in only one way, i.e., 874225 + 769129 = 935^2 + 877^2 .

It is a super-2 number, since 2×1643354² = 5401224738632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1643351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410837 + ... + 410840.

2^1643354 is an apocalyptic number.

1643354 is a deficient number, since it is larger than the sum of its proper divisors (821680).

1643354 is an equidigital number, since it uses as much as digits as its factorization.

1643354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821679.

The product of its digits is 4320, while the sum is 26.

The square root of 1643354 is about 1281.9336956333. The cubic root of 1643354 is about 118.0077080094.

The spelling of 1643354 in words is "one million, six hundred forty-three thousand, three hundred fifty-four".