1240862778 has 24 divisors (see below), whose sum is σ = 2690688000. Its totient is φ = 413289864.

The previous prime is 1240862729. The next prime is 1240862879. The reversal of 1240862778 is 8772680421.

1240862778 is a `hidden beast` number, since 12 + 4 + 0 + 8 + 627 + 7 + 8 = 666.

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, 3928 + ... + 49971.

It is an arithmetic number, because the mean of its divisors is an integer number (112112000).

Almost surely, 2^1240862778 is an apocalyptic number.

1240862778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1240862778 is an abundant number, since it is smaller than the sum of its proper divisors (1449825222).

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

1240862778 is a wasteful number, since it uses less digits than its factorization.

1240862778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55186 (or 55183 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The square root of 1240862778 is about 35225.8822174832. The cubic root of 1240862778 is about 1074.5861837561.

The spelling of 1240862778 in words is "one billion, two hundred forty million, eight hundred sixty-two thousand, seven hundred seventy-eight".