1721394 has 12 divisors (see below), whose sum is σ = 3729726. Its totient is φ = 573792.

The previous prime is 1721383. The next prime is 1721407. The reversal of 1721394 is 4931271.

It can be written as a sum of positive squares in only one way, i.e., 1656369 + 65025 = 1287^2 + 255^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47799 + ... + 47834.

2^1721394 is an apocalyptic number.

1721394 is an abundant number, since it is smaller than the sum of its proper divisors (2008332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1721394 is a wasteful number, since it uses less digits than its factorization.

1721394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95641 (or 95638 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 1721394 is about 1312.0190547397. The cubic root of 1721394 is about 119.8468880559.

The spelling of 1721394 in words is "one million, seven hundred twenty-one thousand, three hundred ninety-four".