40720345 has 4 divisors (see below), whose sum is σ = 48864420. Its totient is φ = 32576272.

The previous prime is 40720331. The next prime is 40720357. The reversal of 40720345 is 54302704.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12194064 + 28526281 = 3492^2 + 5341^2 .

It is a cyclic number.

It is not a de Polignac number, because 40720345 - 2⁷ = 40720217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4072030 + ... + 4072039.

It is an arithmetic number, because the mean of its divisors is an integer number (12216105).

Almost surely, 2^40720345 is an apocalyptic number.

It is an amenable number.

40720345 is a deficient number, since it is larger than the sum of its proper divisors (8144075).

40720345 is an equidigital number, since it uses as much as digits as its factorization.

40720345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8144074.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 40720345 is about 6381.2494857982. The cubic root of 40720345 is about 344.0359419134.

It can be divided in two parts, 407 and 20345, that multiplied together give a triangular number (8280415 = T₄₀₆₉).

The spelling of 40720345 in words is "forty million, seven hundred twenty thousand, three hundred forty-five".