1225170378 has 12 divisors (see below), whose sum is σ = 2654535858. Its totient is φ = 408390120.

The previous prime is 1225170377. The next prime is 1225170389. The reversal of 1225170378 is 8730715221.

It can be written as a sum of positive squares in only one way, i.e., 954995409 + 270174969 = 30903^2 + 16437^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1225170377) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34032493 + ... + 34032528.

Almost surely, 2^1225170378 is an apocalyptic number.

1225170378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1225170378 is an abundant number, since it is smaller than the sum of its proper divisors (1429365480).

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

1225170378 is a wasteful number, since it uses less digits than its factorization.

1225170378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68065029 (or 68065026 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 1225170378 is about 35002.4338868028. The cubic root of 1225170378 is about 1070.0370843408.

Adding to 1225170378 its reverse (8730715221), we get a palindrome (9955885599).

The spelling of 1225170378 in words is "one billion, two hundred twenty-five million, one hundred seventy thousand, three hundred seventy-eight".