40191004 has 48 divisors (see below), whose sum is σ = 87377920. Its totient is φ = 15785280.

The previous prime is 40191001. The next prime is 40191059. The reversal of 40191004 is 40019104.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40191001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15274 + ... + 17710.

Almost surely, 2^40191004 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 40191004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43688960).

40191004 is an abundant number, since it is smaller than the sum of its proper divisors (47186916).

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

40191004 is a wasteful number, since it uses less digits than its factorization.

40191004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2498 (or 2496 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 40191004 is about 6339.6375290706. The cubic root of 40191004 is about 342.5386789216.

It can be divided in two parts, 4019100 and 4, that added together give a palindrome (4019104).

The spelling of 40191004 in words is "forty million, one hundred ninety-one thousand, four".