40878457 has 2 divisors, whose sum is σ = 40878458. Its totient is φ = 40878456.

The previous prime is 40878403. The next prime is 40878473. The reversal of 40878457 is 75487804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39992976 + 885481 = 6324^2 + 941^2 .

It is a cyclic number.

It is not a de Polignac number, because 40878457 - 2¹⁵ = 40845689 is a prime.

It is not a weakly prime, because it can be changed into another prime (40858457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20439228 + 20439229.

It is an arithmetic number, because the mean of its divisors is an integer number (20439229).

Almost surely, 2^40878457 is an apocalyptic number.

It is an amenable number.

40878457 is a deficient number, since it is larger than the sum of its proper divisors (1).

40878457 is an equidigital number, since it uses as much as digits as its factorization.

40878457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 250880, while the sum is 43.

The square root of 40878457 is about 6393.6262793504. The cubic root of 40878457 is about 344.4806496532.

It can be divided in two parts, 4087 and 8457, that added together give a square (12544 = 112²).

The spelling of 40878457 in words is "forty million, eight hundred seventy-eight thousand, four hundred fifty-seven".