19940297 has 8 divisors (see below), whose sum is σ = 21510216. Its totient is φ = 18375552.

The previous prime is 19940293. The next prime is 19940321. The reversal of 19940297 is 79204991.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2808976 + 17131321 = 1676^2 + 4139^2 .

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

It is not a de Polignac number, because 19940297 - 2² = 19940293 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19940293) 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, 11363 + ... + 12999.

It is an arithmetic number, because the mean of its divisors is an integer number (2688777).

Almost surely, 2^19940297 is an apocalyptic number.

It is an amenable number.

19940297 is a deficient number, since it is larger than the sum of its proper divisors (1569919).

19940297 is a wasteful number, since it uses less digits than its factorization.

19940297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2587.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 19940297 is about 4465.4559677596. The cubic root of 19940297 is about 271.1713943268.

The spelling of 19940297 in words is "nineteen million, nine hundred forty thousand, two hundred ninety-seven".