40028518 has 4 divisors (see below), whose sum is σ = 60042780. Its totient is φ = 20014258.

The previous prime is 40028509. The next prime is 40028519. The reversal of 40028518 is 81582004.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40028519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10007128 + ... + 10007131.

It is an arithmetic number, because the mean of its divisors is an integer number (15010695).

Almost surely, 2^40028518 is an apocalyptic number.

40028518 is a deficient number, since it is larger than the sum of its proper divisors (20014262).

40028518 is a wasteful number, since it uses less digits than its factorization.

40028518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20014261.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 40028518 is about 6326.8094644931. The cubic root of 40028518 is about 342.0764451847.

The spelling of 40028518 in words is "forty million, twenty-eight thousand, five hundred eighteen".