40691840 has 128 divisors (see below), whose sum is σ = 115153920. Its totient is φ = 13455360.

The previous prime is 40691839. The next prime is 40691851. The reversal of 40691840 is 4819604.

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 40691797 and 40691806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138734 + ... + 139026.

It is an arithmetic number, because the mean of its divisors is an integer number (899640).

Almost surely, 2^40691840 is an apocalyptic number.

40691840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40691840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57576960).

40691840 is an abundant number, since it is smaller than the sum of its proper divisors (74462080).

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

40691840 is a wasteful number, since it uses less digits than its factorization.

40691840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 40691840 is about 6379.0155980371. The cubic root of 40691840 is about 343.9556459850.

The spelling of 40691840 in words is "forty million, six hundred ninety-one thousand, eight hundred forty".