40501645 has 8 divisors (see below), whose sum is σ = 49787640. Its totient is φ = 31610880.

The previous prime is 40501631. The next prime is 40501649. The reversal of 40501645 is 54610504.

40501645 = 2008² + 2009² + ... + 2017².

It can be written as a sum of positive squares in 4 ways, for example, as 3316041 + 37185604 = 1821^2 + 6098^2 .

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

It is not a de Polignac number, because 40501645 - 2²¹ = 38404493 is a prime.

It is a super-3 number, since 3×40501645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40501649) 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, 98580 + ... + 98989.

It is an arithmetic number, because the mean of its divisors is an integer number (6223455).

Almost surely, 2^40501645 is an apocalyptic number.

It is an amenable number.

40501645 is a deficient number, since it is larger than the sum of its proper divisors (9285995).

40501645 is a wasteful number, since it uses less digits than its factorization.

40501645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197615.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 40501645 is about 6364.0902727727. The cubic root of 40501645 is about 343.4189222214.

The spelling of 40501645 in words is "forty million, five hundred one thousand, six hundred forty-five".