1161204390 has 64 divisors (see below), whose sum is σ = 3102451200. Its totient is φ = 309064032.

The previous prime is 1161204367. The next prime is 1161204409. The reversal of 1161204390 is 934021611.

1161204390 is a `hidden beast` number, since 1 + 1 + 612 + 0 + 43 + 9 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 148191 + ... + 155829.

It is an arithmetic number, because the mean of its divisors is an integer number (48475800).

Almost surely, 2^1161204390 is an apocalyptic number.

1161204390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1161204390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1551225600).

1161204390 is an abundant number, since it is smaller than the sum of its proper divisors (1941246810).

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

1161204390 is a wasteful number, since it uses less digits than its factorization.

1161204390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8218 (or 8212 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1161204390 is about 34076.4491988235. The cubic root of 1161204390 is about 1051.0810905978.

It can be divided in two parts, 1161204 and 390, that multiplied together give a triangular number (452869560 = T₃₀₀₉₅).

The spelling of 1161204390 in words is "one billion, one hundred sixty-one million, two hundred four thousand, three hundred ninety".