1225837278 has 24 divisors (see below), whose sum is σ = 2741658816. Its totient is φ = 395431200.

The previous prime is 1225837267. The next prime is 1225837313. The reversal of 1225837278 is 8727385221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1097863 + ... + 1098978.

It is an arithmetic number, because the mean of its divisors is an integer number (114235784).

Almost surely, 2^1225837278 is an apocalyptic number.

1225837278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1225837278 is an abundant number, since it is smaller than the sum of its proper divisors (1515821538).

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

1225837278 is a wasteful number, since it uses less digits than its factorization.

1225837278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196880 (or 2196877 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 1225837278 is about 35011.9590711517. The cubic root of 1225837278 is about 1070.2312010948.

The spelling of 1225837278 in words is "one billion, two hundred twenty-five million, eight hundred thirty-seven thousand, two hundred seventy-eight".