1670649 has 4 divisors (see below), whose sum is σ = 2227536. Its totient is φ = 1113764.

The previous prime is 1670639. The next prime is 1670653. The reversal of 1670649 is 9460761.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9460761 = 3 ⋅3153587.

It is a cyclic number.

It is not a de Polignac number, because 1670649 - 2⁴ = 1670633 is a prime.

It is an Ulam number.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1670629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278439 + ... + 278444.

It is an arithmetic number, because the mean of its divisors is an integer number (556884).

2^1670649 is an apocalyptic number.

It is an amenable number.

1670649 is a deficient number, since it is larger than the sum of its proper divisors (556887).

1670649 is an equidigital number, since it uses as much as digits as its factorization.

1670649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556886.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 1670649 is about 1292.5358795794. The cubic root of 1670649 is about 118.6574666029.

The spelling of 1670649 in words is "one million, six hundred seventy thousand, six hundred forty-nine".