11898978 has 128 divisors (see below), whose sum is σ = 32686080. Its totient is φ = 2799360.

The previous prime is 11898973. The next prime is 11898983. The reversal of 11898978 is 87989811.

It is an interprime number because it is at equal distance from previous prime (11898973) and next prime (11898983).

Its product of digits (290304) is a multiple of the sum of its prime divisors (112).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11898978.

It is not an unprimeable number, because it can be changed into a prime (11898973) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 321576 + ... + 321612.

It is an arithmetic number, because the mean of its divisors is an integer number (255360).

Almost surely, 2^11898978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11898978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16343040).

11898978 is an abundant number, since it is smaller than the sum of its proper divisors (20787102).

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

11898978 is a wasteful number, since it uses less digits than its factorization.

11898978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112.

The product of its digits is 290304, while the sum is 51.

The square root of 11898978 is about 3449.4895274519. The cubic root of 11898978 is about 228.2985854145.

The spelling of 11898978 in words is "eleven million, eight hundred ninety-eight thousand, nine hundred seventy-eight".