1191428084 has 48 divisors (see below), whose sum is σ = 2683355136. Its totient is φ = 449215200.

The previous prime is 1191428081. The next prime is 1191428087. The reversal of 1191428084 is 4808241911.

It is an interprime number because it is at equal distance from previous prime (1191428081) and next prime (1191428087).

It is a super-2 number, since 2×1191428084² = 2839001758687822112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191428081) 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, 52844 + ... + 71939.

It is an arithmetic number, because the mean of its divisors is an integer number (55903232).

Almost surely, 2^1191428084 is an apocalyptic number.

1191428084 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1191428084 is an abundant number, since it is smaller than the sum of its proper divisors (1491927052).

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

1191428084 is a wasteful number, since it uses less digits than its factorization.

1191428084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124836 (or 124834 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 1191428084 is about 34517.0694584578. The cubic root of 1191428084 is about 1060.1222370010.

Adding to 1191428084 its reverse (4808241911), we get a palindrome (5999669995).

The spelling of 1191428084 in words is "one billion, one hundred ninety-one million, four hundred twenty-eight thousand, eighty-four".