12779990 has 16 divisors (see below), whose sum is σ = 23394960. Its totient is φ = 5025120.

The previous prime is 12779969. The next prime is 12779993. The reversal of 12779990 is 9997721.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12779993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10241 + ... + 11420.

It is an arithmetic number, because the mean of its divisors is an integer number (1462185).

Almost surely, 2^12779990 is an apocalyptic number.

12779990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12779990 is a deficient number, since it is larger than the sum of its proper divisors (10614970).

12779990 is a wasteful number, since it uses less digits than its factorization.

12779990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21727.

The product of its (nonzero) digits is 71442, while the sum is 44.

The square root of 12779990 is about 3574.9111877080. The cubic root of 12779990 is about 233.7994604936.

The spelling of 12779990 in words is "twelve million, seven hundred seventy-nine thousand, nine hundred ninety".