1378961 has 2 divisors, whose sum is σ = 1378962. Its totient is φ = 1378960.

The previous prime is 1378957. The next prime is 1378969. The reversal of 1378961 is 1698731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1308736 + 70225 = 1144^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378961 - 2² = 1378957 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 (1378969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689480 + 689481.

It is an arithmetic number, because the mean of its divisors is an integer number (689481).

2^1378961 is an apocalyptic number.

It is an amenable number.

1378961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378961 is an equidigital number, since it uses as much as digits as its factorization.

1378961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 1378961 is about 1174.2917014098. The cubic root of 1378961 is about 111.3056801612.

The spelling of 1378961 in words is "one million, three hundred seventy-eight thousand, nine hundred sixty-one".