1390387 has 2 divisors, whose sum is σ = 1390388. Its totient is φ = 1390386.

The previous prime is 1390369. The next prime is 1390391. The reversal of 1390387 is 7830931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1390387 - 2¹⁵ = 1357619 is a prime.

It is not a weakly prime, because it can be changed into another prime (1390357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695193 + 695194.

It is an arithmetic number, because the mean of its divisors is an integer number (695194).

2^1390387 is an apocalyptic number.

1390387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390387 is an equidigital number, since it uses as much as digits as its factorization.

1390387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 1390387 is about 1179.1467253909. The cubic root of 1390387 is about 111.6122593299.

The spelling of 1390387 in words is "one million, three hundred ninety thousand, three hundred eighty-seven".