40255440 has 80 divisors (see below), whose sum is σ = 127866816. Its totient is φ = 10470400.

The previous prime is 40255429. The next prime is 40255447. The reversal of 40255440 is 4455204.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 40255440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40255447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7795 + ... + 11885.

Almost surely, 2^40255440 is an apocalyptic number.

40255440 is a gapful number since it is divisible by the number (40) 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 40255440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63933408).

40255440 is an abundant number, since it is smaller than the sum of its proper divisors (87611376).

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

40255440 is a wasteful number, since it uses less digits than its factorization.

40255440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4148 (or 4142 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 40255440 is about 6344.7174878004. The cubic root of 40255440 is about 342.7216389135.

The spelling of 40255440 in words is "forty million, two hundred fifty-five thousand, four hundred forty".