40312738 has 4 divisors (see below), whose sum is σ = 60469110. Its totient is φ = 20156368.

The previous prime is 40312693. The next prime is 40312739. The reversal of 40312738 is 83721304.

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., 36324729 + 3988009 = 6027^2 + 1997^2 .

It is not an unprimeable number, because it can be changed into a prime (40312739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10078183 + ... + 10078186.

Almost surely, 2^40312738 is an apocalyptic number.

40312738 is a deficient number, since it is larger than the sum of its proper divisors (20156372).

40312738 is a wasteful number, since it uses less digits than its factorization.

40312738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20156371.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 40312738 is about 6349.2312920542. The cubic root of 40312738 is about 342.8841672978.

The spelling of 40312738 in words is "forty million, three hundred twelve thousand, seven hundred thirty-eight".