299640978 has 192 divisors, whose sum is σ = 864138240. Its totient is φ = 76204800.

The previous prime is 299640973. The next prime is 299641007. The reversal of 299640978 is 879046992.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (299640973) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1066198 + ... + 1066478.

It is an arithmetic number, because the mean of its divisors is an integer number (4500720).

Almost surely, 2^299640978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 299640978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (432069120).

299640978 is an abundant number, since it is smaller than the sum of its proper divisors (564497262).

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

299640978 is a wasteful number, since it uses less digits than its factorization.

299640978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The square root of 299640978 is about 17310.1409006397. The cubic root of 299640978 is about 669.1657977536.

The spelling of 299640978 in words is "two hundred ninety-nine million, six hundred forty thousand, nine hundred seventy-eight".