1968218990 has 16 divisors (see below), whose sum is σ = 3575906352. Its totient is φ = 779929344.

The previous prime is 1968218983. The next prime is 1968219007. The reversal of 1968218990 is 998128691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 918659 + ... + 920798.

It is an arithmetic number, because the mean of its divisors is an integer number (223494147).

Almost surely, 2^1968218990 is an apocalyptic number.

1968218990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1968218990 is a deficient number, since it is larger than the sum of its proper divisors (1607687362).

1968218990 is a wasteful number, since it uses less digits than its factorization.

1968218990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839571.

The product of its (nonzero) digits is 559872, while the sum is 53.

The square root of 1968218990 is about 44364.6141648950. The cubic root of 1968218990 is about 1253.2117916475.

The spelling of 1968218990 in words is "one billion, nine hundred sixty-eight million, two hundred eighteen thousand, nine hundred ninety".