39849021 has 24 divisors (see below), whose sum is σ = 58920576. Its totient is φ = 25945920.

The previous prime is 39849001. The next prime is 39849031. The reversal of 39849021 is 12094893.

It is not a de Polignac number, because 39849021 - 2¹⁷ = 39717949 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39849001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85836 + ... + 86298.

It is an arithmetic number, because the mean of its divisors is an integer number (2455024).

Almost surely, 2^39849021 is an apocalyptic number.

It is an amenable number.

39849021 is a deficient number, since it is larger than the sum of its proper divisors (19071555).

39849021 is a wasteful number, since it uses less digits than its factorization.

39849021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 39849021 is about 6312.6080980843. The cubic root of 39849021 is about 341.5643627343.

The spelling of 39849021 in words is "thirty-nine million, eight hundred forty-nine thousand, twenty-one".