423155540 has 24 divisors (see below), whose sum is σ = 889759080. Its totient is φ = 169046528.

The previous prime is 423155539. The next prime is 423155543. The reversal of 423155540 is 45551324.

It can be written as a sum of positive squares in 4 ways, for example, as 43217476 + 379938064 = 6574^2 + 19492^2 .

It is a super-2 number, since 2×423155540² = 358121222065383200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423155543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3104 + ... + 29256.

It is an arithmetic number, because the mean of its divisors is an integer number (37073295).

Almost surely, 2^423155540 is an apocalyptic number.

It is an amenable number.

423155540 is an abundant number, since it is smaller than the sum of its proper divisors (466603540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

423155540 is a wasteful number, since it uses less digits than its factorization.

423155540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26971 (or 26969 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 423155540 is about 20570.7447604602. The cubic root of 423155540 is about 750.7580720294.

The spelling of 423155540 in words is "four hundred twenty-three million, one hundred fifty-five thousand, five hundred forty".