1243920398 has 16 divisors (see below), whose sum is σ = 2133420000. Its totient is φ = 532862496.

The previous prime is 1243920371. The next prime is 1243920409. The reversal of 1243920398 is 8930293421.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12728 + ... + 51476.

It is an arithmetic number, because the mean of its divisors is an integer number (133338750).

Almost surely, 2^1243920398 is an apocalyptic number.

1243920398 is a deficient number, since it is larger than the sum of its proper divisors (889499602).

1243920398 is a wasteful number, since it uses less digits than its factorization.

1243920398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41051.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 1243920398 is about 35269.2557052173. The cubic root of 1243920398 is about 1075.4680919466.

The spelling of 1243920398 in words is "one billion, two hundred forty-three million, nine hundred twenty thousand, three hundred ninety-eight".