1924721 has 2 divisors, whose sum is σ = 1924722. Its totient is φ = 1924720.

The previous prime is 1924693. The next prime is 1924751. The reversal of 1924721 is 1274291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1345600 + 579121 = 1160^2 + 761^2 .

It is an emirp because it is prime and its reverse (1274291) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1924721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1924751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 962360 + 962361.

It is an arithmetic number, because the mean of its divisors is an integer number (962361).

2^1924721 is an apocalyptic number.

It is an amenable number.

1924721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1924721 is an equidigital number, since it uses as much as digits as its factorization.

1924721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 1924721 is about 1387.3431442869. The cubic root of 1924721 is about 124.3910866123.

It can be divided in two parts, 192 and 4721, that added together give a cube (4913 = 17³).

The spelling of 1924721 in words is "one million, nine hundred twenty-four thousand, seven hundred twenty-one".