1098978 has 16 divisors (see below), whose sum is σ = 2214336. Its totient is φ = 363600.

The previous prime is 1098973. The next prime is 1098989. The reversal of 1098978 is 8798901.

1098978 = T₃₇ + T₃₈ + ... + T₁₈₇.

It is not an unprimeable number, because it can be changed into a prime (1098973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300 + ... + 1512.

It is an arithmetic number, because the mean of its divisors is an integer number (138396).

2^1098978 is an apocalyptic number.

1098978 is an abundant number, since it is smaller than the sum of its proper divisors (1115358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1098978 is a wasteful number, since it uses less digits than its factorization.

1098978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 1098978 is about 1048.3215155667. The cubic root of 1098978 is about 103.1960322373.

The spelling of 1098978 in words is "one million, ninety-eight thousand, nine hundred seventy-eight".