402023424 has 88 divisors (see below), whose sum is σ = 1169049888. Its totient is φ = 121815040.

The previous prime is 402023393. The next prime is 402023449. The reversal of 402023424 is 424320204.

It is a tau number, because it is divible by the number of its divisors (88).

It is a self number, because there is not a number n which added to its sum of digits gives 402023424.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27844 + ... + 39740.

Almost surely, 2^402023424 is an apocalyptic number.

402023424 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402023424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (584524944).

402023424 is an abundant number, since it is smaller than the sum of its proper divisors (767026464).

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

402023424 is a wasteful number, since it uses less digits than its factorization.

402023424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11931 (or 11913 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 402023424 is about 20050.5217887216. The cubic root of 402023424 is about 738.0466036477.

Adding to 402023424 its reverse (424320204), we get a palindrome (826343628).

The spelling of 402023424 in words is "four hundred two million, twenty-three thousand, four hundred twenty-four".