1185428090 has 48 divisors (see below), whose sum is σ = 2707802784. Its totient is φ = 369482400.

The previous prime is 1185428087. The next prime is 1185428117. The reversal of 1185428090 is 908245811.

It is a super-2 number, since 2×1185428090² = 2810479513122096200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104576 + ... + 115355.

It is an arithmetic number, because the mean of its divisors is an integer number (56412558).

Almost surely, 2^1185428090 is an apocalyptic number.

1185428090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1185428090 is an abundant number, since it is smaller than the sum of its proper divisors (1522374694).

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

1185428090 is a wasteful number, since it uses less digits than its factorization.

1185428090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219963 (or 219956 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 1185428090 is about 34430.0463258474. The cubic root of 1185428090 is about 1058.3396606699.

The spelling of 1185428090 in words is "one billion, one hundred eighty-five million, four hundred twenty-eight thousand, ninety".