1235997819 has 16 divisors (see below), whose sum is σ = 2092695040. Its totient is φ = 706284360.

The previous prime is 1235997817. The next prime is 1235997827. The reversal of 1235997819 is 9187995321.

It is not a de Polignac number, because 1235997819 - 2¹ = 1235997817 is a prime.

It is a super-2 number, since 2×1235997819² = 3055381217145513522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1235997817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3269647 + ... + 3270024.

It is an arithmetic number, because the mean of its divisors is an integer number (130793440).

Almost surely, 2^1235997819 is an apocalyptic number.

1235997819 is a deficient number, since it is larger than the sum of its proper divisors (856697221).

1235997819 is an equidigital number, since it uses as much as digits as its factorization.

1235997819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6539687 (or 6539681 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 1235997819 is about 35156.7606442914. The cubic root of 1235997819 is about 1073.1799942227.

The spelling of 1235997819 in words is "one billion, two hundred thirty-five million, nine hundred ninety-seven thousand, eight hundred nineteen".