1978349 has 2 divisors, whose sum is σ = 1978350. Its totient is φ = 1978348.

The previous prime is 1978343. The next prime is 1978363. The reversal of 1978349 is 9438791.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1841449 + 136900 = 1357^2 + 370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1978349 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1978343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989174 + 989175.

It is an arithmetic number, because the mean of its divisors is an integer number (989175).

2^1978349 is an apocalyptic number.

It is an amenable number.

1978349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978349 is an equidigital number, since it uses as much as digits as its factorization.

1978349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 1978349 is about 1406.5379482972. The cubic root of 1978349 is about 125.5358119626.

The spelling of 1978349 in words is "one million, nine hundred seventy-eight thousand, three hundred forty-nine".