19956398 has 16 divisors (see below), whose sum is σ = 37321344. Its totient is φ = 7775160.

The previous prime is 19956397. The next prime is 19956407. The reversal of 19956398 is 89365991.

It is a super-2 number, since 2×19956398² = 796515642268808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19956397) 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, 64640 + ... + 64947.

It is an arithmetic number, because the mean of its divisors is an integer number (2332584).

Almost surely, 2^19956398 is an apocalyptic number.

19956398 is a deficient number, since it is larger than the sum of its proper divisors (17364946).

19956398 is a wasteful number, since it uses less digits than its factorization.

19956398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129607.

The product of its digits is 524880, while the sum is 50.

The square root of 19956398 is about 4467.2584433856. The cubic root of 19956398 is about 271.2443614110.

The spelling of 19956398 in words is "nineteen million, nine hundred fifty-six thousand, three hundred ninety-eight".