1979669790 has 48 divisors (see below), whose sum is σ = 5882449248. Its totient is φ = 452495808.

The previous prime is 1979669779. The next prime is 1979669801. The reversal of 1979669790 is 979669791.

It is an interprime number because it is at equal distance from previous prime (1979669779) and next prime (1979669801).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1570537 + ... + 1571796.

It is an arithmetic number, because the mean of its divisors is an integer number (122551026).

Almost surely, 2^1979669790 is an apocalyptic number.

1979669790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1979669790 is an abundant number, since it is smaller than the sum of its proper divisors (3902779458).

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

1979669790 is a wasteful number, since it uses less digits than its factorization.

1979669790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3142353 (or 3142350 counting only the distinct ones).

The product of its (nonzero) digits is 11573604, while the sum is 63.

The square root of 1979669790 is about 44493.4803089172. The cubic root of 1979669790 is about 1255.6374258562.

Subtracting from 1979669790 its reverse (979669791), we obtain a palindrome (999999999).

The spelling of 1979669790 in words is "one billion, nine hundred seventy-nine million, six hundred sixty-nine thousand, seven hundred ninety".