1942721 has 4 divisors (see below), whose sum is σ = 2119344. Its totient is φ = 1766100.

The previous prime is 1942669. The next prime is 1942723. The reversal of 1942721 is 1272491.

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 1942721 - 2⁶ = 1942657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1942723) 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, 88295 + ... + 88316.

It is an arithmetic number, because the mean of its divisors is an integer number (529836).

2^1942721 is an apocalyptic number.

1942721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1942721 is a deficient number, since it is larger than the sum of its proper divisors (176623).

1942721 is a wasteful number, since it uses less digits than its factorization.

1942721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176622.

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

The square root of 1942721 is about 1393.8152675301. The cubic root of 1942721 is about 124.7776527280. Note that the first 3 decimals are identical.

The spelling of 1942721 in words is "one million, nine hundred forty-two thousand, seven hundred twenty-one".