1235997820 has 48 divisors (see below), whose sum is σ = 2664119808. Its totient is φ = 481517120.

The previous prime is 1235997817. The next prime is 1235997827. The reversal of 1235997820 is 287995321.

It is a super-2 number, since 2×1235997820² = 3055381222089504800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1235997827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112617 + ... + 123103.

It is an arithmetic number, because the mean of its divisors is an integer number (55502496).

Almost surely, 2^1235997820 is an apocalyptic number.

1235997820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1235997820 is an abundant number, since it is smaller than the sum of its proper divisors (1428121988).

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

1235997820 is a wasteful number, since it uses less digits than its factorization.

1235997820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10650 (or 10648 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 1235997820 is about 35156.7606585135. The cubic root of 1235997820 is about 1073.1799945121.

The spelling of 1235997820 in words is "one billion, two hundred thirty-five million, nine hundred ninety-seven thousand, eight hundred twenty".