40700721 has 8 divisors (see below), whose sum is σ = 54954880. Its totient is φ = 26790192.

The previous prime is 40700719. The next prime is 40700749. The reversal of 40700721 is 12700704.

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

It is not a de Polignac number, because 40700721 - 2¹ = 40700719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40700221) 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, 85630 + ... + 86103.

It is an arithmetic number, because the mean of its divisors is an integer number (6869360).

Almost surely, 2^40700721 is an apocalyptic number.

It is an amenable number.

40700721 is a deficient number, since it is larger than the sum of its proper divisors (14254159).

40700721 is a wasteful number, since it uses less digits than its factorization.

40700721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171815.

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 40700721 is about 6379.7116706008. The cubic root of 40700721 is about 343.9806669548.

The spelling of 40700721 in words is "forty million, seven hundred thousand, seven hundred twenty-one".