1255377978 has 24 divisors (see below), whose sum is σ = 2740754016. Its totient is φ = 415264200.

The previous prime is 1255377967. The next prime is 1255377983. The reversal of 1255377978 is 8797735521.

It is a happy number.

1255377978 is a `hidden beast` number, since 12 + 5 + 537 + 7 + 97 + 8 = 666.

It is a Curzon 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, 263838 + ... + 268553.

It is an arithmetic number, because the mean of its divisors is an integer number (114198084).

Almost surely, 2^1255377978 is an apocalyptic number.

1255377978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1255377978 is an abundant number, since it is smaller than the sum of its proper divisors (1485376038).

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

1255377978 is a wasteful number, since it uses less digits than its factorization.

1255377978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532530 (or 532527 counting only the distinct ones).

The product of its digits is 3704400, while the sum is 54.

The square root of 1255377978 is about 35431.3135234922. The cubic root of 1255377978 is about 1078.7600017423.

The spelling of 1255377978 in words is "one billion, two hundred fifty-five million, three hundred seventy-seven thousand, nine hundred seventy-eight".