19431396 has 18 divisors (see below), whose sum is σ = 49118342. Its totient is φ = 6477120.

The previous prime is 19431329. The next prime is 19431409. The reversal of 19431396 is 69313491.

It can be written as a sum of positive squares in only one way, i.e., 9734400 + 9696996 = 3120^2 + 3114^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 539761 = 19431396 / (1 + 9 + 4 + 3 + 1 + 3 + 9 + 6).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 19431396.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 269845 + ... + 269916.

Almost surely, 2^19431396 is an apocalyptic number.

It is an amenable number.

19431396 is an abundant number, since it is smaller than the sum of its proper divisors (29686946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19431396 is a wasteful number, since it uses less digits than its factorization.

19431396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539771 (or 539766 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 19431396 is about 4408.1057156107. The cubic root of 19431396 is about 268.8446102087.

The spelling of 19431396 in words is "nineteen million, four hundred thirty-one thousand, three hundred ninety-six".