1955218 has 4 divisors (see below), whose sum is σ = 2932830. Its totient is φ = 977608.

The previous prime is 1955203. The next prime is 1955237. The reversal of 1955218 is 8125591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8125591 = 643 ⋅12637.

It can be written as a sum of positive squares in only one way, i.e., 1830609 + 124609 = 1353^2 + 353^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1955218.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488803 + ... + 488806.

2^1955218 is an apocalyptic number.

1955218 is a deficient number, since it is larger than the sum of its proper divisors (977612).

1955218 is an equidigital number, since it uses as much as digits as its factorization.

1955218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977611.

The product of its digits is 3600, while the sum is 31.

The square root of 1955218 is about 1398.2910998787. The cubic root of 1955218 is about 125.0446347267.

The spelling of 1955218 in words is "one million, nine hundred fifty-five thousand, two hundred eighteen".