1649921 has 8 divisors (see below), whose sum is σ = 2030784. Its totient is φ = 1305360.

The previous prime is 1649917. The next prime is 1649927. The reversal of 1649921 is 1299461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1649921 - 2² = 1649917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1649927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8975 + ... + 9156.

It is an arithmetic number, because the mean of its divisors is an integer number (253848).

2^1649921 is an apocalyptic number.

It is an amenable number.

1649921 is a deficient number, since it is larger than the sum of its proper divisors (380863).

1649921 is a wasteful number, since it uses less digits than its factorization.

1649921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18151.

The product of its digits is 3888, while the sum is 32.

The square root of 1649921 is about 1284.4925067901. The cubic root of 1649921 is about 118.1646891259.

The spelling of 1649921 in words is "one million, six hundred forty-nine thousand, nine hundred twenty-one".