240220397 has 2 divisors, whose sum is σ = 240220398. Its totient is φ = 240220396.

The previous prime is 240220339. The next prime is 240220423. The reversal of 240220397 is 793022042.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177715561 + 62504836 = 13331^2 + 7906^2 .

It is a cyclic number.

It is not a de Polignac number, because 240220397 - 2¹⁸ = 239958253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240220307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120110198 + 120110199.

It is an arithmetic number, because the mean of its divisors is an integer number (120110199).

Almost surely, 2^240220397 is an apocalyptic number.

It is an amenable number.

240220397 is a deficient number, since it is larger than the sum of its proper divisors (1).

240220397 is an equidigital number, since it uses as much as digits as its factorization.

240220397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 240220397 is about 15499.0450350981. The cubic root of 240220397 is about 621.6366720796.

The spelling of 240220397 in words is "two hundred forty million, two hundred twenty thousand, three hundred ninety-seven".