1722381 has 4 divisors (see below), whose sum is σ = 2296512. Its totient is φ = 1148252.

The previous prime is 1722377. The next prime is 1722419. The reversal of 1722381 is 1832271.

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 1722381 - 2² = 1722377 is a prime.

It is a super-2 number, since 2×1722381² = 5933192618322, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1722181) 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, 287061 + ... + 287066.

It is an arithmetic number, because the mean of its divisors is an integer number (574128).

2^1722381 is an apocalyptic number.

It is an amenable number.

1722381 is a deficient number, since it is larger than the sum of its proper divisors (574131).

1722381 is an equidigital number, since it uses as much as digits as its factorization.

1722381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574130.

The product of its digits is 672, while the sum is 24.

The square root of 1722381 is about 1312.3951386682. The cubic root of 1722381 is about 119.8697893165.

The spelling of 1722381 in words is "one million, seven hundred twenty-two thousand, three hundred eighty-one".