1089418978 has 4 divisors (see below), whose sum is σ = 1634128470. Its totient is φ = 544709488.

The previous prime is 1089418963. The next prime is 1089418987. The reversal of 1089418978 is 8798149801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8798149801 = 7 ⋅1256878543.

It can be written as a sum of positive squares in only one way, i.e., 1051510329 + 37908649 = 32427^2 + 6157^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272354743 + ... + 272354746.

Almost surely, 2^1089418978 is an apocalyptic number.

1089418978 is a deficient number, since it is larger than the sum of its proper divisors (544709492).

1089418978 is an equidigital number, since it uses as much as digits as its factorization.

1089418978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544709491.

The product of its (nonzero) digits is 1161216, while the sum is 55.

The square root of 1089418978 is about 33006.3475410413. The cubic root of 1089418978 is about 1028.9595733936.

The spelling of 1089418978 in words is "one billion, eighty-nine million, four hundred eighteen thousand, nine hundred seventy-eight".