240999978 has 16 divisors (see below), whose sum is σ = 483183360. Its totient is φ = 80136096.

The previous prime is 240999961. The next prime is 240999989. The reversal of 240999978 is 879999042.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46650 + ... + 51557.

It is an arithmetic number, because the mean of its divisors is an integer number (30198960).

Almost surely, 2^240999978 is an apocalyptic number.

240999978 is an abundant number, since it is smaller than the sum of its proper divisors (242183382).

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

240999978 is a wasteful number, since it uses less digits than its factorization.

240999978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98621.

The product of its (nonzero) digits is 2939328, while the sum is 57.

The square root of 240999978 is about 15524.1739876877. The cubic root of 240999978 is about 622.3084063845.

Adding to 240999978 its sum of digits (57), we get a triangular number (241000035 = T₂₁₉₅₄).

The spelling of 240999978 in words is "two hundred forty million, nine hundred ninety-nine thousand, nine hundred seventy-eight".