19896157 has 4 divisors (see below), whose sum is σ = 20233440. Its totient is φ = 19558876.

The previous prime is 19896133. The next prime is 19896161. The reversal of 19896157 is 75169891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75169891 = 43 ⋅1748137.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19896157 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 (19896167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168553 + ... + 168670.

It is an arithmetic number, because the mean of its divisors is an integer number (5058360).

Almost surely, 2^19896157 is an apocalyptic number.

It is an amenable number.

19896157 is a deficient number, since it is larger than the sum of its proper divisors (337283).

19896157 is an equidigital number, since it uses as much as digits as its factorization.

19896157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337282.

The product of its digits is 136080, while the sum is 46.

The square root of 19896157 is about 4460.5108451835. The cubic root of 19896157 is about 270.9711574538.

The spelling of 19896157 in words is "nineteen million, eight hundred ninety-six thousand, one hundred fifty-seven".