1366139438 has 4 divisors (see below), whose sum is σ = 2049209160. Its totient is φ = 683069718.

The previous prime is 1366139417. The next prime is 1366139443. The reversal of 1366139438 is 8349316631.

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, 341534858 + ... + 341534861.

It is an arithmetic number, because the mean of its divisors is an integer number (512302290).

Almost surely, 2^1366139438 is an apocalyptic number.

1366139438 is a deficient number, since it is larger than the sum of its proper divisors (683069722).

1366139438 is an equidigital number, since it uses as much as digits as its factorization.

1366139438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683069721.

The product of its digits is 279936, while the sum is 44.

The square root of 1366139438 is about 36961.3235423192. The cubic root of 1366139438 is about 1109.5963248194.

The spelling of 1366139438 in words is "one billion, three hundred sixty-six million, one hundred thirty-nine thousand, four hundred thirty-eight".