40820057 has 2 divisors, whose sum is σ = 40820058. Its totient is φ = 40820056.

The previous prime is 40820047. The next prime is 40820069. The reversal of 40820057 is 75002804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29116816 + 11703241 = 5396^2 + 3421^2 .

It is a cyclic number.

It is not a de Polignac number, because 40820057 - 2¹⁶ = 40754521 is a prime.

It is equal to p_2480534 and since 40820057 and 2480534 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40820047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20410028 + 20410029.

It is an arithmetic number, because the mean of its divisors is an integer number (20410029).

Almost surely, 2^40820057 is an apocalyptic number.

It is an amenable number.

40820057 is a deficient number, since it is larger than the sum of its proper divisors (1).

40820057 is an equidigital number, since it uses as much as digits as its factorization.

40820057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 40820057 is about 6389.0575987386. The cubic root of 40820057 is about 344.3165268754.

The spelling of 40820057 in words is "forty million, eight hundred twenty thousand, fifty-seven".