1358639 has 2 divisors, whose sum is σ = 1358640. Its totient is φ = 1358638.

The previous prime is 1358611. The next prime is 1358647. The reversal of 1358639 is 9368531.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1358639 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1358599 and 1358608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1358689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 679319 + 679320.

It is an arithmetic number, because the mean of its divisors is an integer number (679320).

2^1358639 is an apocalyptic number.

1358639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1358639 is an equidigital number, since it uses as much as digits as its factorization.

1358639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 35.

The square root of 1358639 is about 1165.6067089718. The cubic root of 1358639 is about 110.7561945895.

The spelling of 1358639 in words is "one million, three hundred fifty-eight thousand, six hundred thirty-nine".