1990507 has 2 divisors, whose sum is σ = 1990508. Its totient is φ = 1990506.

The previous prime is 1990493. The next prime is 1990523. The reversal of 1990507 is 7050991.

It is a weak prime.

It is an emirp because it is prime and its reverse (7050991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1990507 - 2⁷ = 1990379 is a prime.

1990507 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1990577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995253 + 995254.

It is an arithmetic number, because the mean of its divisors is an integer number (995254).

2^1990507 is an apocalyptic number.

1990507 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990507 is an equidigital number, since it uses as much as digits as its factorization.

1990507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2835, while the sum is 31.

The square root of 1990507 is about 1410.8532879077. The cubic root of 1990507 is about 125.7924482565.

The spelling of 1990507 in words is "one million, nine hundred ninety thousand, five hundred seven".