1956638 has 8 divisors (see below), whose sum is σ = 2942688. Its totient is φ = 975744.

The previous prime is 1956637. The next prime is 1956653. The reversal of 1956638 is 8366591.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1956631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131 + ... + 1982.

It is an arithmetic number, because the mean of its divisors is an integer number (367836).

2^1956638 is an apocalyptic number.

1956638 is a deficient number, since it is larger than the sum of its proper divisors (986050).

1956638 is a wasteful number, since it uses less digits than its factorization.

1956638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2578.

The product of its digits is 38880, while the sum is 38.

The square root of 1956638 is about 1398.7987703741. The cubic root of 1956638 is about 125.0748991120.

The spelling of 1956638 in words is "one million, nine hundred fifty-six thousand, six hundred thirty-eight".