1955638 has 4 divisors (see below), whose sum is σ = 2933460. Its totient is φ = 977818.

The previous prime is 1955633. The next prime is 1955641. The reversal of 1955638 is 8365591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8365591 = 13 ⋅643507.

It is a junction number, because it is equal to n+sod(n) for n = 1955597 and 1955606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1955633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488908 + ... + 488911.

It is an arithmetic number, because the mean of its divisors is an integer number (733365).

2^1955638 is an apocalyptic number.

1955638 is a deficient number, since it is larger than the sum of its proper divisors (977822).

1955638 is an equidigital number, since it uses as much as digits as its factorization.

1955638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977821.

The product of its digits is 32400, while the sum is 37.

The square root of 1955638 is about 1398.4412751346. The cubic root of 1955638 is about 125.0535876903.

The spelling of 1955638 in words is "one million, nine hundred fifty-five thousand, six hundred thirty-eight".