423720649 has 4 divisors (see below), whose sum is σ = 462240720. Its totient is φ = 385200580.

The previous prime is 423720643. The next prime is 423720677. The reversal of 423720649 is 946027324.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423720649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (423720643) 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, 19260019 + ... + 19260040.

It is an arithmetic number, because the mean of its divisors is an integer number (115560180).

Almost surely, 2^423720649 is an apocalyptic number.

It is an amenable number.

423720649 is a deficient number, since it is larger than the sum of its proper divisors (38520071).

423720649 is a wasteful number, since it uses less digits than its factorization.

423720649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38520070.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 423720649 is about 20584.4759224033. The cubic root of 423720649 is about 751.0921268326.

The spelling of 423720649 in words is "four hundred twenty-three million, seven hundred twenty thousand, six hundred forty-nine".