1949721 has 4 divisors (see below), whose sum is σ = 2599632. Its totient is φ = 1299812.

The previous prime is 1949719. The next prime is 1949737. The reversal of 1949721 is 1279491.

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 1949721 - 2¹ = 1949719 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1949741) 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, 324951 + ... + 324956.

It is an arithmetic number, because the mean of its divisors is an integer number (649908).

2^1949721 is an apocalyptic number.

It is an amenable number.

1949721 is a deficient number, since it is larger than the sum of its proper divisors (649911).

1949721 is an equidigital number, since it uses as much as digits as its factorization.

1949721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649910.

The product of its digits is 4536, while the sum is 33.

The square root of 1949721 is about 1396.3241027784. The cubic root of 1949721 is about 124.9273391047.

The spelling of 1949721 in words is "one million, nine hundred forty-nine thousand, seven hundred twenty-one".