1894890649 has 2 divisors, whose sum is σ = 1894890650. Its totient is φ = 1894890648.

The previous prime is 1894890643. The next prime is 1894890659. The reversal of 1894890649 is 9460984981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1193011600 + 701879049 = 34540^2 + 26493^2 .

It is a cyclic number.

It is not a de Polignac number, because 1894890649 - 2⁵ = 1894890617 is a prime.

It is a super-2 number, since 2×1894890649² = 7181221143335282402, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1894890593 and 1894890602.

It is not a weakly prime, because it can be changed into another prime (1894890643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 947445324 + 947445325.

It is an arithmetic number, because the mean of its divisors is an integer number (947445325).

Almost surely, 2^1894890649 is an apocalyptic number.

It is an amenable number.

1894890649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1894890649 is an equidigital number, since it uses as much as digits as its factorization.

1894890649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 58.

The square root of 1894890649 is about 43530.3417055277. The cubic root of 1894890649 is about 1237.4511137237.

The spelling of 1894890649 in words is "one billion, eight hundred ninety-four million, eight hundred ninety thousand, six hundred forty-nine".