1243909898 has 32 divisors (see below), whose sum is σ = 2448714240. Its totient is φ = 459131760.

The previous prime is 1243909883. The next prime is 1243909949. The reversal of 1243909898 is 8989093421.

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, 209636 + ... + 215487.

It is an arithmetic number, because the mean of its divisors is an integer number (76522320).

Almost surely, 2^1243909898 is an apocalyptic number.

1243909898 is a deficient number, since it is larger than the sum of its proper divisors (1204804342).

1243909898 is a wasteful number, since it uses less digits than its factorization.

1243909898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425162.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The square root of 1243909898 is about 35269.1068500465. The cubic root of 1243909898 is about 1075.4650659098.

The spelling of 1243909898 in words is "one billion, two hundred forty-three million, nine hundred nine thousand, eight hundred ninety-eight".