1391212427 has 4 divisors (see below), whose sum is σ = 1517686296. Its totient is φ = 1264738560.

The previous prime is 1391212409. The next prime is 1391212441. The reversal of 1391212427 is 7242121931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7242121931 = 11 ⋅658374721.

It is a cyclic number.

It is not a de Polignac number, because 1391212427 - 2⁶ = 1391212363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1391212393 and 1391212402.

It is not an unprimeable number, because it can be changed into a prime (1391218427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63236918 + ... + 63236939.

It is an arithmetic number, because the mean of its divisors is an integer number (379421574).

Almost surely, 2^1391212427 is an apocalyptic number.

1391212427 is a deficient number, since it is larger than the sum of its proper divisors (126473869).

1391212427 is a wasteful number, since it uses less digits than its factorization.

1391212427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126473868.

The product of its digits is 6048, while the sum is 32.

The square root of 1391212427 is about 37298.9601329581. The cubic root of 1391212427 is about 1116.3434180225.

The spelling of 1391212427 in words is "one billion, three hundred ninety-one million, two hundred twelve thousand, four hundred twenty-seven".