40045420397 has 2 divisors, whose sum is σ = 40045420398. Its totient is φ = 40045420396.

The previous prime is 40045420369. The next prime is 40045420489. The reversal of 40045420397 is 79302454004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32340267556 + 7705152841 = 179834^2 + 87779^2 .

It is a cyclic number.

It is not a de Polignac number, because 40045420397 - 2¹⁰ = 40045419373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40045420397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40045420307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20022710198 + 20022710199.

It is an arithmetic number, because the mean of its divisors is an integer number (20022710199).

Almost surely, 2^40045420397 is an apocalyptic number.

It is an amenable number.

40045420397 is a deficient number, since it is larger than the sum of its proper divisors (1).

40045420397 is an equidigital number, since it uses as much as digits as its factorization.

40045420397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 38.

The spelling of 40045420397 in words is "forty billion, forty-five million, four hundred twenty thousand, three hundred ninety-seven".