40078836 has 72 divisors (see below), whose sum is σ = 117149760. Its totient is φ = 11316096.

The previous prime is 40078823. The next prime is 40078849. The reversal of 40078836 is 63887004.

It is an interprime number because it is at equal distance from previous prime (40078823) and next prime (40078849).

It is a super-2 number, since 2×40078836² = 3212626190229792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 40078836.

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, 21535 + ... + 23321.

It is an arithmetic number, because the mean of its divisors is an integer number (1627080).

Almost surely, 2^40078836 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 40078836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58574880).

40078836 is an abundant number, since it is smaller than the sum of its proper divisors (77070924).

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

40078836 is a wasteful number, since it uses less digits than its factorization.

40078836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893 (or 1888 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 40078836 is about 6330.7847854749. The cubic root of 40078836 is about 342.2197213294.

The spelling of 40078836 in words is "forty million, seventy-eight thousand, eight hundred thirty-six".