1145225820 has 24 divisors (see below), whose sum is σ = 3206632464. Its totient is φ = 305393536.

The previous prime is 1145225759. The next prime is 1145225843. The reversal of 1145225820 is 285225411.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9543489 + ... + 9543608.

It is an arithmetic number, because the mean of its divisors is an integer number (133609686).

Almost surely, 2^1145225820 is an apocalyptic number.

1145225820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1145225820 is an abundant number, since it is smaller than the sum of its proper divisors (2061406644).

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

1145225820 is a wasteful number, since it uses less digits than its factorization.

1145225820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19087109 (or 19087107 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 1145225820 is about 33841.1852629307. The cubic root of 1145225820 is about 1046.2377281883.

The spelling of 1145225820 in words is "one billion, one hundred forty-five million, two hundred twenty-five thousand, eight hundred twenty".