40742281 has 2 divisors, whose sum is σ = 40742282. Its totient is φ = 40742280.

The previous prime is 40742257. The next prime is 40742297. The reversal of 40742281 is 18224704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40449600 + 292681 = 6360^2 + 541^2 .

It is a cyclic number.

It is not a de Polignac number, because 40742281 - 2¹¹ = 40740233 is a prime.

It is a super-2 number, since 2×40742281² = 3319866922165922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40742381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20371140 + 20371141.

It is an arithmetic number, because the mean of its divisors is an integer number (20371141).

Almost surely, 2^40742281 is an apocalyptic number.

It is an amenable number.

40742281 is a deficient number, since it is larger than the sum of its proper divisors (1).

40742281 is an equidigital number, since it uses as much as digits as its factorization.

40742281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 40742281 is about 6382.9680400265. The cubic root of 40742281 is about 344.0977080705.

Adding to 40742281 its reverse (18224704), we get a palindrome (58966985).

The spelling of 40742281 in words is "forty million, seven hundred forty-two thousand, two hundred eighty-one".