140407906 has 4 divisors (see below), whose sum is σ = 210611862. Its totient is φ = 70203952.

The previous prime is 140407867. The next prime is 140407907. The reversal of 140407906 is 609704041.

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., 75846681 + 64561225 = 8709^2 + 8035^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (140407907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35101975 + ... + 35101978.

Almost surely, 2^140407906 is an apocalyptic number.

140407906 is a deficient number, since it is larger than the sum of its proper divisors (70203956).

140407906 is an equidigital number, since it uses as much as digits as its factorization.

140407906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70203955.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 140407906 is about 11849.3842034091. The cubic root of 140407906 is about 519.7532187000.

The spelling of 140407906 in words is "one hundred forty million, four hundred seven thousand, nine hundred six".