1284402378 has 64 divisors (see below), whose sum is σ = 2976030720. Its totient is φ = 361971072.

The previous prime is 1284402331. The next prime is 1284402401. The reversal of 1284402378 is 8732044821.

It is a super-2 number, since 2×1284402378² = 3299378937224109768, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1587238 + ... + 1588046.

It is an arithmetic number, because the mean of its divisors is an integer number (46500480).

Almost surely, 2^1284402378 is an apocalyptic number.

1284402378 is an abundant number, since it is smaller than the sum of its proper divisors (1691628342).

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

1284402378 is a wasteful number, since it uses less digits than its factorization.

1284402378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291.

The product of its (nonzero) digits is 86016, while the sum is 39.

The square root of 1284402378 is about 35838.5599320062. The cubic root of 1284402378 is about 1087.0104027349.

The spelling of 1284402378 in words is "one billion, two hundred eighty-four million, four hundred two thousand, three hundred seventy-eight".