39649421 has 4 divisors (see below), whose sum is σ = 45313632. Its totient is φ = 33985212.

The previous prime is 39649417. The next prime is 39649427. The reversal of 39649421 is 12494693.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12494693 = 149 ⋅83857.

It is a cyclic number.

It is not a de Polignac number, because 39649421 - 2² = 39649417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39649427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2832095 + ... + 2832108.

It is an arithmetic number, because the mean of its divisors is an integer number (11328408).

Almost surely, 2^39649421 is an apocalyptic number.

It is an amenable number.

39649421 is a deficient number, since it is larger than the sum of its proper divisors (5664211).

39649421 is an equidigital number, since it uses as much as digits as its factorization.

39649421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5664210.

The product of its digits is 46656, while the sum is 38.

The square root of 39649421 is about 6296.7786208505. The cubic root of 39649421 is about 340.9931199754.

The spelling of 39649421 in words is "thirty-nine million, six hundred forty-nine thousand, four hundred twenty-one".