40742123 has 2 divisors, whose sum is σ = 40742124. Its totient is φ = 40742122.

The previous prime is 40742101. The next prime is 40742159. The reversal of 40742123 is 32124704.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40742123 - 2⁶ = 40742059 is a prime.

It is not a weakly prime, because it can be changed into another prime (40742423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20371061 + 20371062.

It is an arithmetic number, because the mean of its divisors is an integer number (20371062).

Almost surely, 2^40742123 is an apocalyptic number.

40742123 is a deficient number, since it is larger than the sum of its proper divisors (1).

40742123 is an equidigital number, since it uses as much as digits as its factorization.

40742123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 40742123 is about 6382.9556633271. The cubic root of 40742123 is about 344.0972632623.

Adding to 40742123 its reverse (32124704), we get a palindrome (72866827).

The spelling of 40742123 in words is "forty million, seven hundred forty-two thousand, one hundred twenty-three".