245397978 has 64 divisors (see below), whose sum is σ = 636000000. Its totient is φ = 70108416.

The previous prime is 245397959. The next prime is 245397989. The reversal of 245397978 is 879793542.

245397978 is a `hidden beast` number, since 245 + 397 + 9 + 7 + 8 = 666.

It is a super-3 number, since 3×245397978³ (a number of 26 digits) contains 333 as substring.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11898 + ... + 25146.

It is an arithmetic number, because the mean of its divisors is an integer number (9937500).

Almost surely, 2^245397978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 245397978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318000000).

245397978 is an abundant number, since it is smaller than the sum of its proper divisors (390602022).

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

245397978 is a wasteful number, since it uses less digits than its factorization.

245397978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13281 (or 13261 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 54.

The square root of 245397978 is about 15665.1836248414. The cubic root of 245397978 is about 626.0711045541.

The spelling of 245397978 in words is "two hundred forty-five million, three hundred ninety-seven thousand, nine hundred seventy-eight".