1381507 has 2 divisors, whose sum is σ = 1381508. Its totient is φ = 1381506.

The previous prime is 1381493. The next prime is 1381517. The reversal of 1381507 is 7051831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381507 is a prime.

It is an Ulam number.

1381507 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1381517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690753 + 690754.

It is an arithmetic number, because the mean of its divisors is an integer number (690754).

2^1381507 is an apocalyptic number.

1381507 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381507 is an equidigital number, since it uses as much as digits as its factorization.

1381507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 1381507 is about 1175.3752592258. The cubic root of 1381507 is about 111.3741399253.

The spelling of 1381507 in words is "one million, three hundred eighty-one thousand, five hundred seven".