40391736 has 96 divisors (see below), whose sum is σ = 126913920. Its totient is φ = 10486080.

The previous prime is 40391723. The next prime is 40391801. The reversal of 40391736 is 63719304.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 40391697 and 40391706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19335 + ... + 21321.

It is an arithmetic number, because the mean of its divisors is an integer number (1322020).

Almost surely, 2^40391736 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 40391736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63456960).

40391736 is an abundant number, since it is smaller than the sum of its proper divisors (86522184).

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

40391736 is a wasteful number, since it uses less digits than its factorization.

40391736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025 (or 2010 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 40391736 is about 6355.4493153514. The cubic root of 40391736 is about 343.1079963770.

It can be divided in two parts, 4039 and 1736, that added together give a palindrome (5775).

The spelling of 40391736 in words is "forty million, three hundred ninety-one thousand, seven hundred thirty-six".