1271407 has 4 divisors (see below), whose sum is σ = 1275400. Its totient is φ = 1267416.

The previous prime is 1271401. The next prime is 1271419. The reversal of 1271407 is 7041721.

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

It is a cyclic number.

It is not a de Polignac number, because 1271407 - 2³ = 1271399 is a prime.

It is a Duffinian number.

1271407 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271401) 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 in 3 ways as a sum of consecutive naturals, for example, 1473 + ... + 2170.

It is an arithmetic number, because the mean of its divisors is an integer number (318850).

2^1271407 is an apocalyptic number.

1271407 is a deficient number, since it is larger than the sum of its proper divisors (3993).

1271407 is an equidigital number, since it uses as much as digits as its factorization.

1271407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3992.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 1271407 is about 1127.5668494595. The cubic root of 1271407 is about 108.3331902694. Note that the first 3 decimals are identical.

The spelling of 1271407 in words is "one million, two hundred seventy-one thousand, four hundred seven".