1970391 has 8 divisors (see below), whose sum is σ = 2712064. Its totient is φ = 1271160.

The previous prime is 1970369. The next prime is 1970401. The reversal of 1970391 is 1930791.

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

It is not a de Polignac number, because 1970391 - 2⁵ = 1970359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1970291) 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, 10501 + ... + 10686.

It is an arithmetic number, because the mean of its divisors is an integer number (339008).

2^1970391 is an apocalyptic number.

1970391 is a deficient number, since it is larger than the sum of its proper divisors (741673).

1970391 is a wasteful number, since it uses less digits than its factorization.

1970391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21221.

The product of its (nonzero) digits is 1701, while the sum is 30.

The square root of 1970391 is about 1403.7061658339. The cubic root of 1970391 is about 125.3672612301.

The spelling of 1970391 in words is "one million, nine hundred seventy thousand, three hundred ninety-one".