406621123 has 2 divisors, whose sum is σ = 406621124. Its totient is φ = 406621122.

The previous prime is 406621087. The next prime is 406621129. The reversal of 406621123 is 321126604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406621123 - 2¹³ = 406612931 is a prime.

It is a super-2 number, since 2×406621123² = 330681475339562258, which contains 22 as substring.

It is equal to p_21670405 and since 406621123 and 21670405 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (406621129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203310561 + 203310562.

It is an arithmetic number, because the mean of its divisors is an integer number (203310562).

Almost surely, 2^406621123 is an apocalyptic number.

406621123 is a deficient number, since it is larger than the sum of its proper divisors (1).

406621123 is an equidigital number, since it uses as much as digits as its factorization.

406621123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 406621123 is about 20164.8486976719. The cubic root of 406621123 is about 740.8494767538.

Adding to 406621123 its reverse (321126604), we get a palindrome (727747727).

The spelling of 406621123 in words is "four hundred six million, six hundred twenty-one thousand, one hundred twenty-three".