1287242898 has 16 divisors (see below), whose sum is σ = 2576779680. Its totient is φ = 428698656.

The previous prime is 1287242897. The next prime is 1287242899. The reversal of 1287242898 is 8982427821.

It is an interprime number because it is at equal distance from previous prime (1287242897) and next prime (1287242899).

It is a self number, because there is not a number n which added to its sum of digits gives 1287242898.

It is not an unprimeable number, because it can be changed into a prime (1287242897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88240 + ... + 101787.

It is an arithmetic number, because the mean of its divisors is an integer number (161048730).

Almost surely, 2^1287242898 is an apocalyptic number.

1287242898 is an abundant number, since it is smaller than the sum of its proper divisors (1289536782).

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

1287242898 is a wasteful number, since it uses less digits than its factorization.

1287242898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191161.

The product of its digits is 1032192, while the sum is 51.

The square root of 1287242898 is about 35878.1674281171. The cubic root of 1287242898 is about 1087.8111386652.

The spelling of 1287242898 in words is "one billion, two hundred eighty-seven million, two hundred forty-two thousand, eight hundred ninety-eight".