1670731 has 4 divisors (see below), whose sum is σ = 1673352. Its totient is φ = 1668112.

The previous prime is 1670723. The next prime is 1670741. The reversal of 1670731 is 1370761.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1670731 - 2³ = 1670723 is a prime.

It is a super-2 number, since 2×1670731² = 5582684148722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1670696 and 1670705.

It is not an unprimeable number, because it can be changed into a prime (1670741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336 + ... + 1858.

It is an arithmetic number, because the mean of its divisors is an integer number (418338).

2^1670731 is an apocalyptic number.

1670731 is a deficient number, since it is larger than the sum of its proper divisors (2621).

1670731 is a wasteful number, since it uses less digits than its factorization.

1670731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2620.

The product of its (nonzero) digits is 882, while the sum is 25.

The square root of 1670731 is about 1292.5675997796. The cubic root of 1670731 is about 118.6594079149.

It can be divided in two parts, 1670 and 731, that added together give a 4-th power (2401 = 7⁴).

The spelling of 1670731 in words is "one million, six hundred seventy thousand, seven hundred thirty-one".