1098143978 has 8 divisors (see below), whose sum is σ = 1651129860. Its totient is φ = 547767360.

The previous prime is 1098143953. The next prime is 1098143989. The reversal of 1098143978 is 8793418901.

It can be written as a sum of positive squares in 2 ways, for example, as 718400809 + 379743169 = 26803^2 + 19487^2 .

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, 651263 + ... + 652946.

Almost surely, 2^1098143978 is an apocalyptic number.

1098143978 is a deficient number, since it is larger than the sum of its proper divisors (552985882).

1098143978 is a wasteful number, since it uses less digits than its factorization.

1098143978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304632.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 1098143978 is about 33138.2555062876. The cubic root of 1098143978 is about 1031.6992023665.

The spelling of 1098143978 in words is "one billion, ninety-eight million, one hundred forty-three thousand, nine hundred seventy-eight".