1388651 has 4 divisors (see below), whose sum is σ = 1514904. Its totient is φ = 1262400.

The previous prime is 1388641. The next prime is 1388659. The reversal of 1388651 is 1568831.

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

It is a cyclic number.

It is not a de Polignac number, because 1388651 - 2⁶ = 1388587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63110 + ... + 63131.

It is an arithmetic number, because the mean of its divisors is an integer number (378726).

2^1388651 is an apocalyptic number.

1388651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1388651 is a deficient number, since it is larger than the sum of its proper divisors (126253).

1388651 is a wasteful number, since it uses less digits than its factorization.

1388651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126252.

The product of its digits is 5760, while the sum is 32.

The square root of 1388651 is about 1178.4103699476. The cubic root of 1388651 is about 111.5657879569.

The spelling of 1388651 in words is "one million, three hundred eighty-eight thousand, six hundred fifty-one".