1257279 has 8 divisors (see below), whose sum is σ = 1699632. Its totient is φ = 826560.

The previous prime is 1257253. The next prime is 1257281. The reversal of 1257279 is 9727521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1257279 - 2⁵ = 1257247 is a prime.

It is a super-3 number, since 3×1257279³ = 5962333162719385917, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2652 + ... + 3089.

It is an arithmetic number, because the mean of its divisors is an integer number (212454).

2^1257279 is an apocalyptic number.

1257279 is a deficient number, since it is larger than the sum of its proper divisors (442353).

1257279 is an equidigital number, since it uses as much as digits as its factorization.

1257279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5817.

The product of its digits is 8820, while the sum is 33.

The square root of 1257279 is about 1121.2845312408. The cubic root of 1257279 is about 107.9304250102.

It can be divided in two parts, 1257 and 279, that multiplied together give a triangular number (350703 = T₈₃₇).

The spelling of 1257279 in words is "one million, two hundred fifty-seven thousand, two hundred seventy-nine".