981197904 has 80 divisors (see below), whose sum is σ = 2591352000. Its totient is φ = 319807488.

The previous prime is 981197881. The next prime is 981197909. The reversal of 981197904 is 409791189.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981197909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1141827 + ... + 1142685.

It is an arithmetic number, because the mean of its divisors is an integer number (32391900).

Almost surely, 2^981197904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 981197904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1295676000).

981197904 is an abundant number, since it is smaller than the sum of its proper divisors (1610154096).

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

981197904 is a wasteful number, since it uses less digits than its factorization.

981197904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372 (or 1366 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 48.

The square root of 981197904 is about 31324.0786616303. The cubic root of 981197904 is about 993.6929392813.

It can be divided in two parts, 981197 and 904, that added together give a triangular number (982101 = T₁₄₀₁).

The spelling of 981197904 in words is "nine hundred eighty-one million, one hundred ninety-seven thousand, nine hundred four".