25434440 has 32 divisors (see below), whose sum is σ = 57620160. Its totient is φ = 10104000.

The previous prime is 25434433. The next prime is 25434463. The reversal of 25434440 is 4443452.

It is a super-2 number, since 2×25434440² = 1293821476227200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3935 + ... + 8145.

It is an arithmetic number, because the mean of its divisors is an integer number (1800630).

Almost surely, 2^25434440 is an apocalyptic number.

25434440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25434440 is an abundant number, since it is smaller than the sum of its proper divisors (32185720).

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

25434440 is a wasteful number, since it uses less digits than its factorization.

25434440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4373 (or 4369 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 26.

The square root of 25434440 is about 5043.2568841970. The cubic root of 25434440 is about 294.0858033917.

Adding to 25434440 its reverse (4443452), we get a palindrome (29877892).

The spelling of 25434440 in words is "twenty-five million, four hundred thirty-four thousand, four hundred forty".