1249021898 has 8 divisors (see below), whose sum is σ = 1913395392. Its totient is φ = 611223436.

The previous prime is 1249021889. The next prime is 1249021919. The reversal of 1249021898 is 8981209421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6643640 + ... + 6643827.

It is an arithmetic number, because the mean of its divisors is an integer number (239174424).

Almost surely, 2^1249021898 is an apocalyptic number.

1249021898 is a deficient number, since it is larger than the sum of its proper divisors (664373494).

1249021898 is a wasteful number, since it uses less digits than its factorization.

1249021898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13287516.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 1249021898 is about 35341.5039012207. The cubic root of 1249021898 is about 1076.9363041162.

The spelling of 1249021898 in words is "one billion, two hundred forty-nine million, twenty-one thousand, eight hundred ninety-eight".