1340126638 has 4 divisors (see below), whose sum is σ = 2010189960. Its totient is φ = 670063318.

The previous prime is 1340126617. The next prime is 1340126647. The reversal of 1340126638 is 8366210431.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335031658 + ... + 335031661.

It is an arithmetic number, because the mean of its divisors is an integer number (502547490).

Almost surely, 2^1340126638 is an apocalyptic number.

1340126638 is a deficient number, since it is larger than the sum of its proper divisors (670063322).

1340126638 is an equidigital number, since it uses as much as digits as its factorization.

1340126638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670063321.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 1340126638 is about 36607.7401378452. The cubic root of 1340126638 is about 1102.5085004735.

The spelling of 1340126638 in words is "one billion, three hundred forty million, one hundred twenty-six thousand, six hundred thirty-eight".