1380557 has 2 divisors, whose sum is σ = 1380558. Its totient is φ = 1380556.

The previous prime is 1380551. The next prime is 1380563. The reversal of 1380557 is 7550831.

It is a balanced prime because it is at equal distance from previous prime (1380551) and next prime (1380563).

It can be written as a sum of positive squares in only one way, i.e., 1331716 + 48841 = 1154^2 + 221^2 .

It is a cyclic number.

It is not a de Polignac number, because 1380557 - 2¹² = 1376461 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 (1380551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690278 + 690279.

It is an arithmetic number, because the mean of its divisors is an integer number (690279).

2^1380557 is an apocalyptic number.

It is an amenable number.

1380557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1380557 is an equidigital number, since it uses as much as digits as its factorization.

1380557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 1380557 is about 1174.9710634735. The cubic root of 1380557 is about 111.3486050819.

It can be divided in two parts, 13805 and 57, that multiplied together give a triangular number (786885 = T₁₂₅₄).

The spelling of 1380557 in words is "one million, three hundred eighty thousand, five hundred fifty-seven".