1388744794 has 4 divisors (see below), whose sum is σ = 2083117194. Its totient is φ = 694372396.

The previous prime is 1388744759. The next prime is 1388744809. The reversal of 1388744794 is 4974478831.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 1340511769 + 48233025 = 36613^2 + 6945^2 .

It is a super-2 number, since 2×1388744794² = 3857224205724204872, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 347186197 + ... + 347186200.

Almost surely, 2^1388744794 is an apocalyptic number.

1388744794 is a deficient number, since it is larger than the sum of its proper divisors (694372400).

1388744794 is an equidigital number, since it uses as much as digits as its factorization.

1388744794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694372399.

The product of its digits is 5419008, while the sum is 55.

The square root of 1388744794 is about 37265.8663390508. The cubic root of 1388744794 is about 1115.6829973892.

The spelling of 1388744794 in words is "one billion, three hundred eighty-eight million, seven hundred forty-four thousand, seven hundred ninety-four".