40399210 has 16 divisors (see below), whose sum is σ = 72859176. Its totient is φ = 16128448.

The previous prime is 40399159. The next prime is 40399217. The reversal of 40399210 is 1299304.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 28015849 + 12383361 = 5293^2 + 3519^2 .

It is not an unprimeable number, because it can be changed into a prime (40399217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1944 + ... + 9196.

Almost surely, 2^40399210 is an apocalyptic number.

40399210 is a deficient number, since it is larger than the sum of its proper divisors (32459966).

40399210 is a wasteful number, since it uses less digits than its factorization.

40399210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7817.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 40399210 is about 6356.0372874929. The cubic root of 40399210 is about 343.1291577272.

The spelling of 40399210 in words is "forty million, three hundred ninety-nine thousand, two hundred ten".