1378553 has 6 divisors (see below), whose sum is σ = 1515402. Its totient is φ = 1253120.

The previous prime is 1378541. The next prime is 1378561. The reversal of 1378553 is 3558731.

Added to its reverse (3558731) it gives a square (4937284 = 2222²).

It can be written as a sum of positive squares in only one way, i.e., 1283689 + 94864 = 1133^2 + 308^2 .

It is not a de Polignac number, because 1378553 - 2²⁰ = 329977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5576 + ... + 5817.

It is an arithmetic number, because the mean of its divisors is an integer number (252567).

2^1378553 is an apocalyptic number.

It is an amenable number.

1378553 is a deficient number, since it is larger than the sum of its proper divisors (136849).

1378553 is a wasteful number, since it uses less digits than its factorization.

1378553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11415 (or 11404 counting only the distinct ones).

The product of its digits is 12600, while the sum is 32.

The square root of 1378553 is about 1174.1179668159. The cubic root of 1378553 is about 111.2947015579.

Adding to 1378553 its reverse (3558731), we get a square (4937284 = 2222²).

The spelling of 1378553 in words is "one million, three hundred seventy-eight thousand, five hundred fifty-three".