19970913 has 8 divisors (see below), whose sum is σ = 27486976. Its totient is φ = 12884400.

The previous prime is 19970897. The next prime is 19970941. The reversal of 19970913 is 31907991.

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

It is not a de Polignac number, because 19970913 - 2⁴ = 19970897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19970953) 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, 107278 + ... + 107463.

It is an arithmetic number, because the mean of its divisors is an integer number (3435872).

Almost surely, 2^19970913 is an apocalyptic number.

It is an amenable number.

19970913 is a deficient number, since it is larger than the sum of its proper divisors (7516063).

19970913 is a wasteful number, since it uses less digits than its factorization.

19970913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214775.

The product of its (nonzero) digits is 15309, while the sum is 39.

The square root of 19970913 is about 4468.8827462801. The cubic root of 19970913 is about 271.3101073730.

The spelling of 19970913 in words is "nineteen million, nine hundred seventy thousand, nine hundred thirteen".