1972391 has 8 divisors (see below), whose sum is σ = 2104560. Its totient is φ = 1842048.

The previous prime is 1972381. The next prime is 1972417. The reversal of 1972391 is 1932791.

It is a happy number.

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-1972391 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 (1972361) 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, 2300 + ... + 3038.

It is an arithmetic number, because the mean of its divisors is an integer number (263070).

2^1972391 is an apocalyptic number.

1972391 is a deficient number, since it is larger than the sum of its proper divisors (132169).

1972391 is a wasteful number, since it uses less digits than its factorization.

1972391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913.

The product of its digits is 3402, while the sum is 32.

The square root of 1972391 is about 1404.4183849551. The cubic root of 1972391 is about 125.4096639370.

The spelling of 1972391 in words is "one million, nine hundred seventy-two thousand, three hundred ninety-one".