424400025 has 72 divisors (see below), whose sum is σ = 851891904. Its totient is φ = 185539200.

The previous prime is 424400021. The next prime is 424400029. The reversal of 424400025 is 520004424.

It is an interprime number because it is at equal distance from previous prime (424400021) and next prime (424400029).

It is not a de Polignac number, because 424400025 - 2² = 424400021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 424399974 and 424400010.

It is not an unprimeable number, because it can be changed into a prime (424400021) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 82015 + ... + 87035.

It is an arithmetic number, because the mean of its divisors is an integer number (11831832).

Almost surely, 2^424400025 is an apocalyptic number.

It is an amenable number.

424400025 is an abundant number, since it is smaller than the sum of its proper divisors (427491879).

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

424400025 is a wasteful number, since it uses less digits than its factorization.

424400025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5071 (or 5059 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 424400025 is about 20600.9714576765. The cubic root of 424400025 is about 751.4933357355.

Adding to 424400025 its reverse (520004424), we get a palindrome (944404449).

The spelling of 424400025 in words is "four hundred twenty-four million, four hundred thousand, twenty-five".