1388916643 has 8 divisors (see below), whose sum is σ = 1479642768. Its totient is φ = 1299193344.

The previous prime is 1388916637. The next prime is 1388916649. The reversal of 1388916643 is 3466198831.

It is an interprime number because it is at equal distance from previous prime (1388916637) and next prime (1388916649).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1388916643 - 2¹⁷ = 1388785571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388916649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247846 + ... + 253387.

It is an arithmetic number, because the mean of its divisors is an integer number (184955346).

Almost surely, 2^1388916643 is an apocalyptic number.

1388916643 is a deficient number, since it is larger than the sum of its proper divisors (90726125).

1388916643 is a wasteful number, since it uses less digits than its factorization.

1388916643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501413.

The product of its digits is 746496, while the sum is 49.

The square root of 1388916643 is about 37268.1719836109. The cubic root of 1388916643 is about 1115.7290152274.

The spelling of 1388916643 in words is "one billion, three hundred eighty-eight million, nine hundred sixteen thousand, six hundred forty-three".