400140023 has 2 divisors, whose sum is σ = 400140024. Its totient is φ = 400140022.

The previous prime is 400139939. The next prime is 400140047. The reversal of 400140023 is 320041004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400140023 is a prime.

It is a super-2 number, since 2×400140023² = 320224076012881058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400110023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200070011 + 200070012.

It is an arithmetic number, because the mean of its divisors is an integer number (200070012).

Almost surely, 2^400140023 is an apocalyptic number.

400140023 is a deficient number, since it is larger than the sum of its proper divisors (1).

400140023 is an equidigital number, since it uses as much as digits as its factorization.

400140023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 400140023 is about 20003.5002687030. The cubic root of 400140023 is about 736.8922645551.

Adding to 400140023 its reverse (320041004), we get a palindrome (720181027).

The spelling of 400140023 in words is "four hundred million, one hundred forty thousand, twenty-three".