1672621 has 4 divisors (see below), whose sum is σ = 1682044. Its totient is φ = 1663200.

The previous prime is 1672609. The next prime is 1672631. The reversal of 1672621 is 1262761.

1672621 = 914² + 915².

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

It can be written as a sum of positive squares in 2 ways, for example, as 837225 + 835396 = 915^2 + 914^2 .

It is a cyclic number.

It is not a de Polignac number, because 1672621 - 2¹⁵ = 1639853 is a prime.

It is a super-2 number, since 2×1672621² = 5595322019282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1672631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4440 + ... + 4801.

It is an arithmetic number, because the mean of its divisors is an integer number (420511).

2^1672621 is an apocalyptic number.

1672621 is the 915-th centered square number.

It is an amenable number.

1672621 is a deficient number, since it is larger than the sum of its proper divisors (9423).

1672621 is an equidigital number, since it uses as much as digits as its factorization.

1672621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9422.

The product of its digits is 1008, while the sum is 25.

The square root of 1672621 is about 1293.2984960944. The cubic root of 1672621 is about 118.7041351965.

The spelling of 1672621 in words is "one million, six hundred seventy-two thousand, six hundred twenty-one".