240721989 has 8 divisors (see below), whose sum is σ = 339842880. Its totient is φ = 151041216.

The previous prime is 240721981. The next prime is 240721997. The reversal of 240721989 is 989127042.

It is an interprime number because it is at equal distance from previous prime (240721981) and next prime (240721997).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 240721989 - 2³ = 240721981 is a prime.

It is a super-2 number, since 2×240721989² = 115894151976232242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 240721989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240721981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2359969 + ... + 2360070.

It is an arithmetic number, because the mean of its divisors is an integer number (42480360).

Almost surely, 2^240721989 is an apocalyptic number.

It is an amenable number.

240721989 is a deficient number, since it is larger than the sum of its proper divisors (99120891).

240721989 is a wasteful number, since it uses less digits than its factorization.

240721989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4720059.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 240721989 is about 15515.2179810662. The cubic root of 240721989 is about 622.0690405954.

The spelling of 240721989 in words is "two hundred forty million, seven hundred twenty-one thousand, nine hundred eighty-nine".