1151855380 has 24 divisors (see below), whose sum is σ = 2604965832. Its totient is φ = 425300352.

The previous prime is 1151855363. The next prime is 1151855381. The reversal of 1151855380 is 835581511.

It can be written as a sum of positive squares in 4 ways, for example, as 61402896 + 1090452484 = 7836^2 + 33022^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151855381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2214847 + ... + 2215366.

It is an arithmetic number, because the mean of its divisors is an integer number (108540243).

Almost surely, 2^1151855380 is an apocalyptic number.

1151855380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1151855380 is an abundant number, since it is smaller than the sum of its proper divisors (1453110452).

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

1151855380 is a wasteful number, since it uses less digits than its factorization.

1151855380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4430235 (or 4430233 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 37.

The square root of 1151855380 is about 33938.9949762806. The cubic root of 1151855380 is about 1048.2526887621.

The spelling of 1151855380 in words is "one billion, one hundred fifty-one million, eight hundred fifty-five thousand, three hundred eighty".