1284772398 has 32 divisors (see below), whose sum is σ = 3162518016. Its totient is φ = 338840928.

The previous prime is 1284772367. The next prime is 1284772403. The reversal of 1284772398 is 8932774821.

It is a super-2 number, since 2×1284772398² = 3301280229325340808, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1284772398.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1175986 + ... + 1177077.

It is an arithmetic number, because the mean of its divisors is an integer number (98828688).

Almost surely, 2^1284772398 is an apocalyptic number.

1284772398 is an abundant number, since it is smaller than the sum of its proper divisors (1877745618).

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

1284772398 is a wasteful number, since it uses less digits than its factorization.

1284772398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353088.

The product of its digits is 1354752, while the sum is 51.

The square root of 1284772398 is about 35843.7218770596. The cubic root of 1284772398 is about 1087.1147773395.

The spelling of 1284772398 in words is "one billion, two hundred eighty-four million, seven hundred seventy-two thousand, three hundred ninety-eight".