45440040 has 32 divisors (see below), whose sum is σ = 136320480. Its totient is φ = 12117312.

The previous prime is 45440009. The next prime is 45440047. The reversal of 45440040 is 4004454.

It is a junction number, because it is equal to n+sod(n) for n = 45439989 and 45440016.

It is not an unprimeable number, because it can be changed into a prime (45440047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189214 + ... + 189453.

It is an arithmetic number, because the mean of its divisors is an integer number (4260015).

Almost surely, 2^45440040 is an apocalyptic number.

45440040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

45440040 is an abundant number, since it is smaller than the sum of its proper divisors (90880440).

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

45440040 is a wasteful number, since it uses less digits than its factorization.

45440040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378681 (or 378677 counting only the distinct ones).

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

The square root of 45440040 is about 6740.9227854946. The cubic root of 45440040 is about 356.8449608862.

Adding to 45440040 its reverse (4004454), we get a palindrome (49444494).

The spelling of 45440040 in words is "forty-five million, four hundred forty thousand, forty".