1667279 has 2 divisors, whose sum is σ = 1667280. Its totient is φ = 1667278.

The previous prime is 1667251. The next prime is 1667287. The reversal of 1667279 is 9727661.

It is a strong prime.

It is an emirp because it is prime and its reverse (9727661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1667279 - 2¹² = 1663183 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1667209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833639 + 833640.

It is an arithmetic number, because the mean of its divisors is an integer number (833640).

2^1667279 is an apocalyptic number.

1667279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667279 is an equidigital number, since it uses as much as digits as its factorization.

1667279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 38.

The square root of 1667279 is about 1291.2315826373. The cubic root of 1667279 is about 118.5776284007.

The spelling of 1667279 in words is "one million, six hundred sixty-seven thousand, two hundred seventy-nine".