40035721 has 8 divisors (see below), whose sum is σ = 44741088. Its totient is φ = 35508000.

The previous prime is 40035707. The next prime is 40035733. The reversal of 40035721 is 12753004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40035721 - 2²⁵ = 6481289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40035692 and 40035701.

It is not an unprimeable number, because it can be changed into a prime (40035761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43935 + ... + 44836.

It is an arithmetic number, because the mean of its divisors is an integer number (5592636).

Almost surely, 2^40035721 is an apocalyptic number.

40035721 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

40035721 is a deficient number, since it is larger than the sum of its proper divisors (4705367).

40035721 is a wasteful number, since it uses less digits than its factorization.

40035721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88823.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 40035721 is about 6327.3786831515. The cubic root of 40035721 is about 342.0969624640.

Adding to 40035721 its reverse (12753004), we get a palindrome (52788725).

It can be divided in two parts, 400 and 35721, that multiplied together give a square (14288400 = 3780²).

The spelling of 40035721 in words is "forty million, thirty-five thousand, seven hundred twenty-one".