40742857 has 2 divisors, whose sum is σ = 40742858. Its totient is φ = 40742856.

The previous prime is 40742839. The next prime is 40742869. The reversal of 40742857 is 75824704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24710841 + 16032016 = 4971^2 + 4004^2 .

It is a cyclic number.

It is not a de Polignac number, because 40742857 - 2¹⁹ = 40218569 is a prime.

It is not a weakly prime, because it can be changed into another prime (40742827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20371428 + 20371429.

It is an arithmetic number, because the mean of its divisors is an integer number (20371429).

Almost surely, 2^40742857 is an apocalyptic number.

It is an amenable number.

40742857 is a deficient number, since it is larger than the sum of its proper divisors (1).

40742857 is an equidigital number, since it uses as much as digits as its factorization.

40742857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62720, while the sum is 37.

The square root of 40742857 is about 6383.0131599426. The cubic root of 40742857 is about 344.0993296402.

It can be divided in two parts, 407 and 42857, that added together give a square (43264 = 208²).

The spelling of 40742857 in words is "forty million, seven hundred forty-two thousand, eight hundred fifty-seven".