39840545 has 8 divisors (see below), whose sum is σ = 48522624. Its totient is φ = 31396464.

The previous prime is 39840533. The next prime is 39840547. The reversal of 39840545 is 54504893.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 39840545 - 2⁴ = 39840529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39840499 and 39840508.

It is not an unprimeable number, because it can be changed into a prime (39840547) 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, 59129 + ... + 59798.

It is an arithmetic number, because the mean of its divisors is an integer number (6065328).

Almost surely, 2^39840545 is an apocalyptic number.

It is an amenable number.

39840545 is a deficient number, since it is larger than the sum of its proper divisors (8682079).

39840545 is a wasteful number, since it uses less digits than its factorization.

39840545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118999.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 39840545 is about 6311.9367075407. The cubic root of 39840545 is about 341.5401437803.

The spelling of 39840545 in words is "thirty-nine million, eight hundred forty thousand, five hundred forty-five".