1378653 has 8 divisors (see below), whose sum is σ = 1869600. Its totient is φ = 903408.

The previous prime is 1378639. The next prime is 1378669. The reversal of 1378653 is 3568731.

It is a happy number.

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

It is not a de Polignac number, because 1378653 - 2⁶ = 1378589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378603) 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, 3718 + ... + 4071.

It is an arithmetic number, because the mean of its divisors is an integer number (233700).

2^1378653 is an apocalyptic number.

It is an amenable number.

1378653 is a deficient number, since it is larger than the sum of its proper divisors (490947).

1378653 is an equidigital number, since it uses as much as digits as its factorization.

1378653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7851.

The product of its digits is 15120, while the sum is 33.

The square root of 1378653 is about 1174.1605512024. The cubic root of 1378653 is about 111.2973925924.

It can be divided in two parts, 137865 and 3, that multiplied together give a triangular number (413595 = T₉₀₉).

The spelling of 1378653 in words is "one million, three hundred seventy-eight thousand, six hundred fifty-three".