1391226929 has 4 divisors (see below), whose sum is σ = 1391467584. Its totient is φ = 1390986276.

The previous prime is 1391226913. The next prime is 1391226989. The reversal of 1391226929 is 9296221931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9296221931 = 373 ⋅24922847.

It is a cyclic number.

It is not a de Polignac number, because 1391226929 - 2⁴ = 1391226913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1391226929.

It is not an unprimeable number, because it can be changed into a prime (1391226989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111437 + ... + 123290.

It is an arithmetic number, because the mean of its divisors is an integer number (347866896).

Almost surely, 2^1391226929 is an apocalyptic number.

It is an amenable number.

1391226929 is a deficient number, since it is larger than the sum of its proper divisors (240655).

1391226929 is an equidigital number, since it uses as much as digits as its factorization.

1391226929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240654.

The product of its digits is 104976, while the sum is 44.

The square root of 1391226929 is about 37299.1545346540. The cubic root of 1391226929 is about 1116.3472969308.

The spelling of 1391226929 in words is "one billion, three hundred ninety-one million, two hundred twenty-six thousand, nine hundred twenty-nine".