19797951 has 8 divisors (see below), whose sum is σ = 26959104. Its totient is φ = 12917720.

The previous prime is 19797941. The next prime is 19797959. The reversal of 19797951 is 15979791.

It is a happy number.

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 19797951 - 2⁶ = 19797887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19797951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19797959) 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, 70065 + ... + 70346.

It is an arithmetic number, because the mean of its divisors is an integer number (3369888).

Almost surely, 2^19797951 is an apocalyptic number.

19797951 is a deficient number, since it is larger than the sum of its proper divisors (7161153).

19797951 is a wasteful number, since it uses less digits than its factorization.

19797951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140461.

The product of its digits is 178605, while the sum is 48.

The square root of 19797951 is about 4449.4888470475. The cubic root of 19797951 is about 270.5245905236.

The spelling of 19797951 in words is "nineteen million, seven hundred ninety-seven thousand, nine hundred fifty-one".