1672639 has 2 divisors, whose sum is σ = 1672640. Its totient is φ = 1672638.

The previous prime is 1672637. The next prime is 1672651. The reversal of 1672639 is 9362761.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1672639 - 2¹ = 1672637 is a prime.

Together with 1672637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1672631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836319 + 836320.

It is an arithmetic number, because the mean of its divisors is an integer number (836320).

2^1672639 is an apocalyptic number.

1672639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1672639 is an equidigital number, since it uses as much as digits as its factorization.

1672639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 34.

The square root of 1672639 is about 1293.3054550260. The cubic root of 1672639 is about 118.7045610086.

The spelling of 1672639 in words is "one million, six hundred seventy-two thousand, six hundred thirty-nine".