423840929 has 2 divisors, whose sum is σ = 423840930. Its totient is φ = 423840928.

The previous prime is 423840919. The next prime is 423840943. The reversal of 423840929 is 929048324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306075025 + 117765904 = 17495^2 + 10852^2 .

It is a cyclic number.

It is not a de Polignac number, because 423840929 - 2⁸ = 423840673 is a prime.

It is a super-2 number, since 2×423840929² = 359282266191166082, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (423840919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211920464 + 211920465.

It is an arithmetic number, because the mean of its divisors is an integer number (211920465).

Almost surely, 2^423840929 is an apocalyptic number.

It is an amenable number.

423840929 is a deficient number, since it is larger than the sum of its proper divisors (1).

423840929 is an equidigital number, since it uses as much as digits as its factorization.

423840929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 423840929 is about 20587.3973342917. The cubic root of 423840929 is about 751.1631900157.

The spelling of 423840929 in words is "four hundred twenty-three million, eight hundred forty thousand, nine hundred twenty-nine".