5431440 has 160 divisors (see below), whose sum is σ = 19927296. Its totient is φ = 1198080.

The previous prime is 5431399. The next prime is 5431441. The reversal of 5431440 is 441345.

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

It is not an unprimeable number, because it can be changed into a prime (5431441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89010 + ... + 89070.

Almost surely, 2^5431440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5431440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9963648).

5431440 is an abundant number, since it is smaller than the sum of its proper divisors (14495856).

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

5431440 is a wasteful number, since it uses less digits than its factorization.

5431440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 5431440 is about 2330.5450006383. The cubic root of 5431440 is about 175.7808912487.

Adding to 5431440 its reverse (441345), we get a palindrome (5872785).

The spelling of 5431440 in words is "five million, four hundred thirty-one thousand, four hundred forty".