1639970 has 8 divisors (see below), whose sum is σ = 2951964. Its totient is φ = 655984.

The previous prime is 1639949. The next prime is 1639987. The reversal of 1639970 is 799361.

It can be written as a sum of positive squares in 2 ways, for example, as 1515361 + 124609 = 1231^2 + 353^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1639970.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81989 + ... + 82008.

2^1639970 is an apocalyptic number.

1639970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1639970 is a deficient number, since it is larger than the sum of its proper divisors (1311994).

1639970 is a wasteful number, since it uses less digits than its factorization.

1639970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164004.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 1639970 is about 1280.6131344009. The cubic root of 1639970 is about 117.9266517257.

The spelling of 1639970 in words is "one million, six hundred thirty-nine thousand, nine hundred seventy".