40207481 has 2 divisors, whose sum is σ = 40207482. Its totient is φ = 40207480.

The previous prime is 40207471. The next prime is 40207487. The reversal of 40207481 is 18470204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40195600 + 11881 = 6340^2 + 109^2 .

It is a cyclic number.

It is not a de Polignac number, because 40207481 - 2⁶ = 40207417 is a prime.

It is a super-2 number, since 2×40207481² = 3233283056730722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40207481.

It is not a weakly prime, because it can be changed into another prime (40207487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20103740 + 20103741.

It is an arithmetic number, because the mean of its divisors is an integer number (20103741).

Almost surely, 2^40207481 is an apocalyptic number.

It is an amenable number.

40207481 is a deficient number, since it is larger than the sum of its proper divisors (1).

40207481 is an equidigital number, since it uses as much as digits as its factorization.

40207481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 40207481 is about 6340.9369181533. The cubic root of 40207481 is about 342.5854824194.

Adding to 40207481 its reverse (18470204), we get a palindrome (58677685).

The spelling of 40207481 in words is "forty million, two hundred seven thousand, four hundred eighty-one".