40028306 has 4 divisors (see below), whose sum is σ = 60042462. Its totient is φ = 20014152.

The previous prime is 40028299. The next prime is 40028321. The reversal of 40028306 is 60382004.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 25090081 + 14938225 = 5009^2 + 3865^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10007075 + ... + 10007078.

Almost surely, 2^40028306 is an apocalyptic number.

40028306 is a deficient number, since it is larger than the sum of its proper divisors (20014156).

40028306 is a wasteful number, since it uses less digits than its factorization.

40028306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20014155.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 40028306 is about 6326.7927103707. The cubic root of 40028306 is about 342.0758412791.

The spelling of 40028306 in words is "forty million, twenty-eight thousand, three hundred six".