40305438 has 48 divisors (see below), whose sum is σ = 91203840. Its totient is φ = 13340376.

The previous prime is 40305409. The next prime is 40305443. The reversal of 40305438 is 83450304.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115981 + ... + 116327.

It is an arithmetic number, because the mean of its divisors is an integer number (1900080).

Almost surely, 2^40305438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40305438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45601920).

40305438 is an abundant number, since it is smaller than the sum of its proper divisors (50898402).

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

40305438 is a wasteful number, since it uses less digits than its factorization.

40305438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603 (or 591 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 40305438 is about 6348.6563932851. The cubic root of 40305438 is about 342.8634690797.

The spelling of 40305438 in words is "forty million, three hundred five thousand, four hundred thirty-eight".