1149578172 has 36 divisors (see below), whose sum is σ = 2976757056. Its totient is φ = 373846080.

The previous prime is 1149578149. The next prime is 1149578173. The reversal of 1149578172 is 2718759411.

It is a happy number.

1149578172 is a `hidden beast` number, since 1 + 1 + 4 + 9 + 578 + 1 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×1149578172³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1149578173) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 387948 + ... + 390899.

It is an arithmetic number, because the mean of its divisors is an integer number (82687696).

Almost surely, 2^1149578172 is an apocalyptic number.

1149578172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1149578172 is an abundant number, since it is smaller than the sum of its proper divisors (1827178884).

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

1149578172 is a wasteful number, since it uses less digits than its factorization.

1149578172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778898 (or 778893 counting only the distinct ones).

The product of its digits is 141120, while the sum is 45.

The square root of 1149578172 is about 33905.4298306333. The cubic root of 1149578172 is about 1047.5614375670.

The spelling of 1149578172 in words is "one billion, one hundred forty-nine million, five hundred seventy-eight thousand, one hundred seventy-two".