1720431 has 12 divisors (see below), whose sum is σ = 2616120. Its totient is φ = 1086480.

The previous prime is 1720429. The next prime is 1720457. The reversal of 1720431 is 1340271.

It is not a de Polignac number, because 1720431 - 2¹ = 1720429 is a prime.

It is a super-2 number, since 2×1720431² = 5919765651522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4860 + ... + 5201.

It is an arithmetic number, because the mean of its divisors is an integer number (218010).

2^1720431 is an apocalyptic number.

1720431 is a deficient number, since it is larger than the sum of its proper divisors (895689).

1720431 is a wasteful number, since it uses less digits than its factorization.

1720431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10086 (or 10083 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 1720431 is about 1311.6520117775. The cubic root of 1720431 is about 119.8245352260.

The spelling of 1720431 in words is "one million, seven hundred twenty thousand, four hundred thirty-one".