39649820 has 36 divisors (see below), whose sum is σ = 96861240. Its totient is φ = 13593888.

The previous prime is 39649807. The next prime is 39649823. The reversal of 39649820 is 2894693.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39649823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19250 + ... + 21209.

It is an arithmetic number, because the mean of its divisors is an integer number (2690590).

Almost surely, 2^39649820 is an apocalyptic number.

It is an amenable number.

39649820 is an abundant number, since it is smaller than the sum of its proper divisors (57211420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39649820 is a wasteful number, since it uses less digits than its factorization.

39649820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40482 (or 40473 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 39649820 is about 6296.8103036379. The cubic root of 39649820 is about 340.9942637987.

The spelling of 39649820 in words is "thirty-nine million, six hundred forty-nine thousand, eight hundred twenty".