1156438998 has 64 divisors (see below), whose sum is σ = 3019161600. Its totient is φ = 323477280.

The previous prime is 1156438993. The next prime is 1156439027. The reversal of 1156438998 is 8998346511.

1156438998 is a `hidden beast` number, since 115 + 6 + 438 + 9 + 98 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156438993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67158 + ... + 82601.

It is an arithmetic number, because the mean of its divisors is an integer number (47174400).

Almost surely, 2^1156438998 is an apocalyptic number.

1156438998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1156438998 is an abundant number, since it is smaller than the sum of its proper divisors (1862722602).

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

1156438998 is a wasteful number, since it uses less digits than its factorization.

1156438998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149794 (or 149788 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 1156438998 is about 34006.4552401452. The cubic root of 1156438998 is about 1049.6412978819.

The spelling of 1156438998 in words is "one billion, one hundred fifty-six million, four hundred thirty-eight thousand, nine hundred ninety-eight".