42020040397 has 2 divisors, whose sum is σ = 42020040398. Its totient is φ = 42020040396.

The previous prime is 42020040389. The next prime is 42020040427. The reversal of 42020040397 is 79304002024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39834571396 + 2185469001 = 199586^2 + 46749^2 .

It is a cyclic number.

It is not a de Polignac number, because 42020040397 - 2³ = 42020040389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42020040347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21010020198 + 21010020199.

It is an arithmetic number, because the mean of its divisors is an integer number (21010020199).

Almost surely, 2^42020040397 is an apocalyptic number.

It is an amenable number.

42020040397 is a deficient number, since it is larger than the sum of its proper divisors (1).

42020040397 is an equidigital number, since it uses as much as digits as its factorization.

42020040397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The spelling of 42020040397 in words is "forty-two billion, twenty million, forty thousand, three hundred ninety-seven".