1225761378 has 16 divisors (see below), whose sum is σ = 2452033056. Its totient is φ = 408502080.

The previous prime is 1225761377. The next prime is 1225761401. The reversal of 1225761378 is 8731675221.

It is not an unprimeable number, because it can be changed into a prime (1225761371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14625 + ... + 51627.

It is an arithmetic number, because the mean of its divisors is an integer number (153252066).

Almost surely, 2^1225761378 is an apocalyptic number.

1225761378 is an abundant number, since it is smaller than the sum of its proper divisors (1226271678).

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

1225761378 is a wasteful number, since it uses less digits than its factorization.

1225761378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42529.

The product of its digits is 141120, while the sum is 42.

The square root of 1225761378 is about 35010.8751390193. The cubic root of 1225761378 is about 1070.2091121857.

The spelling of 1225761378 in words is "one billion, two hundred twenty-five million, seven hundred sixty-one thousand, three hundred seventy-eight".