40294728 has 24 divisors (see below), whose sum is σ = 109131750. Its totient is φ = 13431552.

The previous prime is 40294711. The next prime is 40294729. The reversal of 40294728 is 82749204.

It can be written as a sum of positive squares in only one way, i.e., 23794884 + 16499844 = 4878^2 + 4062^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 40294692 and 40294701.

It is not an unprimeable number, because it can be changed into a prime (40294729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 279753 + ... + 279896.

Almost surely, 2^40294728 is an apocalyptic number.

It is an amenable number.

40294728 is an abundant number, since it is smaller than the sum of its proper divisors (68837022).

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

40294728 is a wasteful number, since it uses less digits than its factorization.

40294728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559661 (or 559654 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 40294728 is about 6347.8128516836. The cubic root of 40294728 is about 342.8330977185.

The spelling of 40294728 in words is "forty million, two hundred ninety-four thousand, seven hundred twenty-eight".