1380931 has 2 divisors, whose sum is σ = 1380932. Its totient is φ = 1380930.

The previous prime is 1380913. The next prime is 1380947. The reversal of 1380931 is 1390831.

Together with previous prime (1380913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1380931 - 2⁹ = 1380419 is a prime.

It is a super-2 number, since 2×1380931² = 3813940853522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1380896 and 1380905.

It is not a weakly prime, because it can be changed into another prime (1380971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690465 + 690466.

It is an arithmetic number, because the mean of its divisors is an integer number (690466).

2^1380931 is an apocalyptic number.

1380931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1380931 is an equidigital number, since it uses as much as digits as its factorization.

1380931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1380931 is about 1175.1302055517. The cubic root of 1380931 is about 111.3586591442.

The spelling of 1380931 in words is "one million, three hundred eighty thousand, nine hundred thirty-one".