1205523378 has 32 divisors (see below), whose sum is σ = 2685208320. Its totient is φ = 400901040.

The previous prime is 1205523377. The next prime is 1205523427. The reversal of 1205523378 is 8733255021.

It is a happy number.

1205523378 is a `hidden beast` number, since 1 + 2 + 0 + 552 + 33 + 78 = 666.

It is a super-2 number, since 2×1205523378² = 2906573229809061768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1205523373) 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, 2625 + ... + 49172.

It is an arithmetic number, because the mean of its divisors is an integer number (83912760).

Almost surely, 2^1205523378 is an apocalyptic number.

1205523378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1205523378 is an abundant number, since it is smaller than the sum of its proper divisors (1479684942).

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

1205523378 is a wasteful number, since it uses less digits than its factorization.

1205523378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52239 (or 52233 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 1205523378 is about 34720.6477186126. The cubic root of 1205523378 is about 1064.2864810065.

Adding to 1205523378 its reverse (8733255021), we get a palindrome (9938778399).

The spelling of 1205523378 in words is "one billion, two hundred five million, five hundred twenty-three thousand, three hundred seventy-eight".