40071999 has 24 divisors (see below), whose sum is σ = 59971968. Its totient is φ = 23603040.

The previous prime is 40071979. The next prime is 40072031. The reversal of 40071999 is 99917004.

It is not a de Polignac number, because 40071999 - 2¹¹ = 40069951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40071919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44734 + ... + 45620.

It is an arithmetic number, because the mean of its divisors is an integer number (2498832).

Almost surely, 2^40071999 is an apocalyptic number.

40071999 is a deficient number, since it is larger than the sum of its proper divisors (19899969).

40071999 is a wasteful number, since it uses less digits than its factorization.

40071999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975 (or 938 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 40071999 is about 6330.2447819970. The cubic root of 40071999 is about 342.2002606071.

It can be divided in two parts, 40071 and 999, that multiplied together give a square (40030929 = 6327²).

The spelling of 40071999 in words is "forty million, seventy-one thousand, nine hundred ninety-nine".