1381421 has 2 divisors, whose sum is σ = 1381422. Its totient is φ = 1381420.

The previous prime is 1381411. The next prime is 1381427. The reversal of 1381421 is 1241831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1297321 + 84100 = 1139^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381421 - 2¹⁰ = 1380397 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1381393 and 1381402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1381427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690710 + 690711.

It is an arithmetic number, because the mean of its divisors is an integer number (690711).

2^1381421 is an apocalyptic number.

It is an amenable number.

1381421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381421 is an equidigital number, since it uses as much as digits as its factorization.

1381421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 20.

The square root of 1381421 is about 1175.3386745955. The cubic root of 1381421 is about 111.3718288320.

The spelling of 1381421 in words is "one million, three hundred eighty-one thousand, four hundred twenty-one".