240978421 has 2 divisors, whose sum is σ = 240978422. Its totient is φ = 240978420.

The previous prime is 240978403. The next prime is 240978427. The reversal of 240978421 is 124879042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217562500 + 23415921 = 14750^2 + 4839^2 .

It is a cyclic number.

It is not a de Polignac number, because 240978421 - 2⁵ = 240978389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240978427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120489210 + 120489211.

It is an arithmetic number, because the mean of its divisors is an integer number (120489211).

Almost surely, 2^240978421 is an apocalyptic number.

It is an amenable number.

240978421 is a deficient number, since it is larger than the sum of its proper divisors (1).

240978421 is an equidigital number, since it uses as much as digits as its factorization.

240978421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 240978421 is about 15523.4796679095. The cubic root of 240978421 is about 622.2898510546.

The spelling of 240978421 in words is "two hundred forty million, nine hundred seventy-eight thousand, four hundred twenty-one".