40402123 has 2 divisors, whose sum is σ = 40402124. Its totient is φ = 40402122.

The previous prime is 40402091. The next prime is 40402127. The reversal of 40402123 is 32120404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40402123 - 2⁵ = 40402091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40402097 and 40402106.

It is not a weakly prime, because it can be changed into another prime (40402127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20201061 + 20201062.

It is an arithmetic number, because the mean of its divisors is an integer number (20201062).

Almost surely, 2^40402123 is an apocalyptic number.

40402123 is a deficient number, since it is larger than the sum of its proper divisors (1).

40402123 is an equidigital number, since it uses as much as digits as its factorization.

40402123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 40402123 is about 6356.2664355736. The cubic root of 40402123 is about 343.1374046807.

Adding to 40402123 its reverse (32120404), we get a palindrome (72522527).

The spelling of 40402123 in words is "forty million, four hundred two thousand, one hundred twenty-three".