1729431 has 24 divisors (see below), whose sum is σ = 2830464. Its totient is φ = 1046520.

The previous prime is 1729391. The next prime is 1729433. The reversal of 1729431 is 1349271.

It is a de Polignac number, because none of the positive numbers 2^k-1729431 is a prime.

It is a super-2 number, since 2×1729431² = 5981863167522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1729395 and 1729404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1729433) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2350 + ... + 2996.

It is an arithmetic number, because the mean of its divisors is an integer number (117936).

2^1729431 is an apocalyptic number.

1729431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1729431 is a deficient number, since it is larger than the sum of its proper divisors (1101033).

1729431 is an equidigital number, since it uses as much as digits as its factorization.

1729431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673 (or 661 counting only the distinct ones).

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

The square root of 1729431 is about 1315.0783246636. The cubic root of 1729431 is about 120.0331158603.

The spelling of 1729431 in words is "one million, seven hundred twenty-nine thousand, four hundred thirty-one".