1378445 has 8 divisors (see below), whose sum is σ = 1751544.
Its totient is φ = 1037824.
The previous prime is 1378441. The next prime is 1378499. The reversal of 1378445 is 5448731.
It can be written as a sum of positive squares in 4 ways, for example, as 481636 + 896809 = 694^2 + 947^2
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 1378445 - 22 = 1378441 is a prime.
It is a super-2 number, since 2×13784452 = 3800221236050, which contains 22 as substring.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1378441) 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, 8024 + ... + 8193.
It is an arithmetic number, because the mean of its divisors is an integer number (218943).
21378445 is an apocalyptic number.
It is an amenable number.
1378445 is a deficient number, since it is larger than the sum of its proper divisors (373099).
1378445 is a wasteful number, since it uses less digits than its factorization.
1378445 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 16239.
The product of its digits is 13440, while the sum is 32.
The square root of 1378445 is about 1174.0719739437.
The cubic root of 1378445 is about 111.2917950945.
The spelling of 1378445 in words is "one million, three hundred seventy-eight thousand, four hundred forty-five".