40399090 has 16 divisors (see below), whose sum is σ = 73275840. Its totient is φ = 16035760.

The previous prime is 40399069. The next prime is 40399097. The reversal of 40399090 is 9099304.

It is not an unprimeable number, because it can be changed into a prime (40399097) 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, 14110 + ... + 16729.

It is an arithmetic number, because the mean of its divisors is an integer number (4579740).

Almost surely, 2^40399090 is an apocalyptic number.

40399090 is a deficient number, since it is larger than the sum of its proper divisors (32876750).

40399090 is a wasteful number, since it uses less digits than its factorization.

40399090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30977.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 40399090 is about 6356.0278476420. The cubic root of 40399090 is about 343.1288179884.

The spelling of 40399090 in words is "forty million, three hundred ninety-nine thousand, ninety".