1979448690 has 32 divisors (see below), whose sum is σ = 5000713920. Its totient is φ = 500071104.

The previous prime is 1979448683. The next prime is 1979448697. The reversal of 1979448690 is 968449791.

It is an interprime number because it is at equal distance from previous prime (1979448683) and next prime (1979448697).

It is a super-2 number, since 2×1979448690² = 7836434232685432200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 1979448690.

It is not an unprimeable number, because it can be changed into a prime (1979448697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1735789 + ... + 1736928.

It is an arithmetic number, because the mean of its divisors is an integer number (156272310).

Almost surely, 2^1979448690 is an apocalyptic number.

1979448690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1979448690 is an abundant number, since it is smaller than the sum of its proper divisors (3021265230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1979448690 is a wasteful number, since it uses less digits than its factorization.

1979448690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3472746.

The product of its (nonzero) digits is 3919104, while the sum is 57.

The square root of 1979448690 is about 44490.9956058527. The cubic root of 1979448690 is about 1255.5906787047.

The spelling of 1979448690 in words is "one billion, nine hundred seventy-nine million, four hundred forty-eight thousand, six hundred ninety".