19912797 has 20 divisors (see below), whose sum is σ = 31498236. Its totient is φ = 12493440.

The previous prime is 19912793. The next prime is 19912799. The reversal of 19912797 is 79721991.

It can be written as a sum of positive squares in 2 ways, for example, as 7338681 + 12574116 = 2709^2 + 3546^2 .

It is not a de Polignac number, because 19912797 - 2² = 19912793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19912793) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5854 + ... + 8607.

Almost surely, 2^19912797 is an apocalyptic number.

19912797 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19912797 is a deficient number, since it is larger than the sum of its proper divisors (11585439).

19912797 is a wasteful number, since it uses less digits than its factorization.

19912797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14490 (or 14481 counting only the distinct ones).

The product of its digits is 71442, while the sum is 45.

The square root of 19912797 is about 4462.3757125549. The cubic root of 19912797 is about 271.0466779615.

It can be divided in two parts, 199 and 12797, that added together give a square (12996 = 114²).

The spelling of 19912797 in words is "nineteen million, nine hundred twelve thousand, seven hundred ninety-seven".