1634649 has 4 divisors (see below), whose sum is σ = 2179536. Its totient is φ = 1089764.

The previous prime is 1634609. The next prime is 1634657. The reversal of 1634649 is 9464361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1634649 - 2⁸ = 1634393 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1634609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272439 + ... + 272444.

It is an arithmetic number, because the mean of its divisors is an integer number (544884).

2^1634649 is an apocalyptic number.

It is an amenable number.

1634649 is a deficient number, since it is larger than the sum of its proper divisors (544887).

1634649 is an equidigital number, since it uses as much as digits as its factorization.

1634649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544886.

The product of its digits is 15552, while the sum is 33.

The square root of 1634649 is about 1278.5339260262. The cubic root of 1634649 is about 117.7989730522.

The spelling of 1634649 in words is "one million, six hundred thirty-four thousand, six hundred forty-nine".