649995842 has 4 divisors (see below), whose sum is σ = 974993766. Its totient is φ = 324997920.

The previous prime is 649995823. The next prime is 649995859. The reversal of 649995842 is 248599946.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 631064641 + 18931201 = 25121^2 + 4351^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162498959 + ... + 162498962.

Almost surely, 2^649995842 is an apocalyptic number.

649995842 is a deficient number, since it is larger than the sum of its proper divisors (324997924).

649995842 is a wasteful number, since it uses less digits than its factorization.

649995842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324997923.

The product of its digits is 5598720, while the sum is 56.

The square root of 649995842 is about 25495.0160227445. The cubic root of 649995842 is about 866.2372582487.

The spelling of 649995842 in words is "six hundred forty-nine million, nine hundred ninety-five thousand, eight hundred forty-two".