40307988 has 60 divisors (see below), whose sum is σ = 109799200. Its totient is φ = 11508336.

The previous prime is 40307957. The next prime is 40308001. The reversal of 40307988 is 88970304.

It is a nialpdrome in base 7.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 28113 + ... + 29511.

Almost surely, 2^40307988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40307988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54899600).

40307988 is an abundant number, since it is smaller than the sum of its proper divisors (69491212).

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

40307988 is a wasteful number, since it uses less digits than its factorization.

40307988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434 (or 1411 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 40307988 is about 6348.8572200042. The cubic root of 40307988 is about 342.8706995632.

The spelling of 40307988 in words is "forty million, three hundred seven thousand, nine hundred eighty-eight".