978499440 has 400 divisors, whose sum is σ = 3629767680. Its totient is φ = 243855360.

The previous prime is 978499427. The next prime is 978499463. The reversal of 978499440 is 44994879.

It is a happy number.

It is a super-2 number, since 2×978499440² = 1914922308160627200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 7704657 + ... + 7704783.

Almost surely, 2^978499440 is an apocalyptic number.

978499440 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 978499440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1814883840).

978499440 is an abundant number, since it is smaller than the sum of its proper divisors (2651268240).

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

978499440 is a wasteful number, since it uses less digits than its factorization.

978499440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 978499440 is about 31280.9756881079. The cubic root of 978499440 is about 992.7811604169.

The spelling of 978499440 in words is "nine hundred seventy-eight million, four hundred ninety-nine thousand, four hundred forty".