40019688 has 24 divisors (see below), whose sum is σ = 108386850. Its totient is φ = 13339872.

The previous prime is 40019687. The next prime is 40019689. The reversal of 40019688 is 88691004.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (40019687) and next prime (40019689).

It can be written as a sum of positive squares in only one way, i.e., 35784324 + 4235364 = 5982^2 + 2058^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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

It is not an unprimeable number, because it can be changed into a prime (40019687) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 277843 + ... + 277986.

Almost surely, 2^40019688 is an apocalyptic number.

It is an amenable number.

40019688 is an abundant number, since it is smaller than the sum of its proper divisors (68367162).

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

40019688 is a wasteful number, since it uses less digits than its factorization.

40019688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555841 (or 555834 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 40019688 is about 6326.1116019242. Note that the first 3 decimals coincide. The cubic root of 40019688 is about 342.0512901428.

It can be divided in two parts, 4001 and 9688, that added together give a square (13689 = 117²).

The spelling of 40019688 in words is "forty million, nineteen thousand, six hundred eighty-eight".