1995218774 has 4 divisors (see below), whose sum is σ = 2992828164. Its totient is φ = 997609386.

The previous prime is 1995218773. The next prime is 1995218779. The reversal of 1995218774 is 4778125991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4778125991 = 229 ⋅20865179.

It is a super-2 number, since 2×1995218774² = 7961795912244126152, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1995218773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498804692 + ... + 498804695.

It is an arithmetic number, because the mean of its divisors is an integer number (748207041).

Almost surely, 2^1995218774 is an apocalyptic number.

1995218774 is a deficient number, since it is larger than the sum of its proper divisors (997609390).

1995218774 is an equidigital number, since it uses as much as digits as its factorization.

1995218774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997609389.

The product of its digits is 1270080, while the sum is 53.

The square root of 1995218774 is about 44667.8718320002. The cubic root of 1995218774 is about 1258.9162542295.

The spelling of 1995218774 in words is "one billion, nine hundred ninety-five million, two hundred eighteen thousand, seven hundred seventy-four".