1990277 has 2 divisors, whose sum is σ = 1990278. Its totient is φ = 1990276.

The previous prime is 1990273. The next prime is 1990279. The reversal of 1990277 is 7720991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1018081 + 972196 = 1009^2 + 986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990277 - 2² = 1990273 is a prime.

It is a super-2 number, since 2×1990277² = 7922405073458, which contains 22 as substring.

Together with 1990279, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995138 + 995139.

It is an arithmetic number, because the mean of its divisors is an integer number (995139).

2^1990277 is an apocalyptic number.

It is an amenable number.

1990277 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990277 is an equidigital number, since it uses as much as digits as its factorization.

1990277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 1990277 is about 1410.7717745972. The cubic root of 1990277 is about 125.7876030290.

The spelling of 1990277 in words is "one million, nine hundred ninety thousand, two hundred seventy-seven".