1970639 has 8 divisors (see below), whose sum is σ = 2219520. Its totient is φ = 1733400.

The previous prime is 1970629. The next prime is 1970641. The reversal of 1970639 is 9360791.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1970639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1970599 and 1970608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1970629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2549 + ... + 3230.

It is an arithmetic number, because the mean of its divisors is an integer number (277440).

2^1970639 is an apocalyptic number.

1970639 is a deficient number, since it is larger than the sum of its proper divisors (248881).

1970639 is a wasteful number, since it uses less digits than its factorization.

1970639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5821.

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

The square root of 1970639 is about 1403.7945006303. The cubic root of 1970639 is about 125.3725207236.

The spelling of 1970639 in words is "one million, nine hundred seventy thousand, six hundred thirty-nine".