19773997 has 8 divisors (see below), whose sum is σ = 20926080. Its totient is φ = 18646320.

The previous prime is 19773979. The next prime is 19774061. The reversal of 19773997 is 79937791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19773997 - 2⁷ = 19773869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19773917) 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, 4422 + ... + 7687.

It is an arithmetic number, because the mean of its divisors is an integer number (2615760).

Almost surely, 2^19773997 is an apocalyptic number.

It is an amenable number.

19773997 is a deficient number, since it is larger than the sum of its proper divisors (1152083).

19773997 is a wasteful number, since it uses less digits than its factorization.

19773997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12203.

The product of its digits is 750141, while the sum is 52.

The square root of 19773997 is about 4446.7962624793. The cubic root of 19773997 is about 270.4154418329.

The spelling of 19773997 in words is "nineteen million, seven hundred seventy-three thousand, nine hundred ninety-seven".