1388649 has 8 divisors (see below), whose sum is σ = 1870272. Its totient is φ = 916400.

The previous prime is 1388641. The next prime is 1388659. The reversal of 1388649 is 9468831.

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 1388649 - 2³ = 1388641 is a prime.

It is a super-3 number, since 3×1388649³ = 8033387421966970347, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1388641) 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, 1989 + ... + 2594.

It is an arithmetic number, because the mean of its divisors is an integer number (233784).

2^1388649 is an apocalyptic number.

It is an amenable number.

1388649 is a deficient number, since it is larger than the sum of its proper divisors (481623).

1388649 is a wasteful number, since it uses less digits than its factorization.

1388649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4687.

The product of its digits is 41472, while the sum is 39.

The square root of 1388649 is about 1178.4095213465. The cubic root of 1388649 is about 111.5657343961.

The spelling of 1388649 in words is "one million, three hundred eighty-eight thousand, six hundred forty-nine".