1155723730 has 32 divisors (see below), whose sum is σ = 2399316480. Its totient is φ = 392610240.

The previous prime is 1155723721. The next prime is 1155723731. The reversal of 1155723730 is 373275511.

It is a super-2 number, since 2×1155723730² = 2671394680170225800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1155723731) 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, 68106 + ... + 83365.

It is an arithmetic number, because the mean of its divisors is an integer number (74978640).

Almost surely, 2^1155723730 is an apocalyptic number.

1155723730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1155723730 is an abundant number, since it is smaller than the sum of its proper divisors (1243592750).

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

1155723730 is a wasteful number, since it uses less digits than its factorization.

1155723730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151594.

The product of its (nonzero) digits is 22050, while the sum is 34.

The square root of 1155723730 is about 33995.9369631137. The cubic root of 1155723730 is about 1049.4248490324.

The spelling of 1155723730 in words is "one billion, one hundred fifty-five million, seven hundred twenty-three thousand, seven hundred thirty".