1578397 has 2 divisors, whose sum is σ = 1578398. Its totient is φ = 1578396.

The previous prime is 1578389. The next prime is 1578407. The reversal of 1578397 is 7938751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1390041 + 188356 = 1179^2 + 434^2 .

It is a cyclic number.

It is not a de Polignac number, because 1578397 - 2³ = 1578389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1578347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 789198 + 789199.

It is an arithmetic number, because the mean of its divisors is an integer number (789199).

2^1578397 is an apocalyptic number.

It is an amenable number.

1578397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1578397 is an equidigital number, since it uses as much as digits as its factorization.

1578397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 40.

The square root of 1578397 is about 1256.3427080220. The cubic root of 1578397 is about 116.4319261905.

The spelling of 1578397 in words is "one million, five hundred seventy-eight thousand, three hundred ninety-seven".