1660431 has 8 divisors (see below), whose sum is σ = 2222640. Its totient is φ = 1102592.

The previous prime is 1660423. The next prime is 1660433. The reversal of 1660431 is 1340661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1660431 - 2³ = 1660423 is a prime.

It is a super-2 number, since 2×1660431² = 5514062211522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1660398 and 1660407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66 + ... + 1823.

It is an arithmetic number, because the mean of its divisors is an integer number (277830).

2^1660431 is an apocalyptic number.

1660431 is a deficient number, since it is larger than the sum of its proper divisors (562209).

1660431 is a wasteful number, since it uses less digits than its factorization.

1660431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1660431 is about 1288.5771222554. The cubic root of 1660431 is about 118.4150613525.

The spelling of 1660431 in words is "one million, six hundred sixty thousand, four hundred thirty-one".