40304240 has 20 divisors (see below), whose sum is σ = 93707544. Its totient is φ = 16121664.

The previous prime is 40304237. The next prime is 40304261. The reversal of 40304240 is 4240304.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251822 + ... + 251981.

Almost surely, 2^40304240 is an apocalyptic number.

40304240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40304240 is an abundant number, since it is smaller than the sum of its proper divisors (53403304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40304240 is a wasteful number, since it uses less digits than its factorization.

40304240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503816 (or 503810 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 40304240 is about 6348.5620419115. The cubic root of 40304240 is about 342.8600720649.

Adding to 40304240 its reverse (4240304), we get a palindrome (44544544).

The spelling of 40304240 in words is "forty million, three hundred four thousand, two hundred forty".