1249820836 has 48 divisors (see below), whose sum is σ = 2554272000. Its totient is φ = 529057440.

The previous prime is 1249820821. The next prime is 1249820837. The reversal of 1249820836 is 6380289421.

It is a junction number, because it is equal to n+sod(n) for n = 1249820792 and 1249820801.

It is not an unprimeable number, because it can be changed into a prime (1249820837) 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, 36655 + ... + 61993.

It is an arithmetic number, because the mean of its divisors is an integer number (53214000).

Almost surely, 2^1249820836 is an apocalyptic number.

It is an amenable number.

1249820836 is an abundant number, since it is smaller than the sum of its proper divisors (1304451164).

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

1249820836 is a wasteful number, since it uses less digits than its factorization.

1249820836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25432 (or 25430 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 1249820836 is about 35352.8052069422. The cubic root of 1249820836 is about 1077.1658762719.

The spelling of 1249820836 in words is "one billion, two hundred forty-nine million, eight hundred twenty thousand, eight hundred thirty-six".