1378897 has 8 divisors (see below), whose sum is σ = 1506344. Its totient is φ = 1254528.

The previous prime is 1378859. The next prime is 1378903. The reversal of 1378897 is 7988731.

It can be written as a sum of positive squares in 4 ways, for example, as 370881 + 1008016 = 609^2 + 1004^2 .

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 1378897 - 2¹⁵ = 1346129 is a prime.

It is an Ulam number.

It is a Duffinian number.

1378897 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1378807) 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, 223 + ... + 1675.

It is an arithmetic number, because the mean of its divisors is an integer number (188293).

2^1378897 is an apocalyptic number.

It is an amenable number.

1378897 is a deficient number, since it is larger than the sum of its proper divisors (127447).

1378897 is a wasteful number, since it uses less digits than its factorization.

1378897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539.

The product of its digits is 84672, while the sum is 43.

The square root of 1378897 is about 1174.2644506243. The cubic root of 1378897 is about 111.3039581705.

The spelling of 1378897 in words is "one million, three hundred seventy-eight thousand, eight hundred ninety-seven".