1869649 has 2 divisors, whose sum is σ = 1869650. Its totient is φ = 1869648.

The previous prime is 1869631. The next prime is 1869691. The reversal of 1869649 is 9469681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 986049 + 883600 = 993^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 1869649 - 2⁵ = 1869617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1869449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934824 + 934825.

It is an arithmetic number, because the mean of its divisors is an integer number (934825).

2^1869649 is an apocalyptic number.

It is an amenable number.

1869649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1869649 is an equidigital number, since it uses as much as digits as its factorization.

1869649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 1869649 is about 1367.3510887844. The cubic root of 1869649 is about 123.1931879421.

The spelling of 1869649 in words is "one million, eight hundred sixty-nine thousand, six hundred forty-nine".