649974 has 24 divisors (see below), whose sum is σ = 1409832. Its totient is φ = 199680.

The previous prime is 649969. The next prime is 649981. The reversal of 649974 is 479946.

It is a Harshad number since it is a multiple of its sum of digits (39).

Its product of digits (54432) is a multiple of the sum of its prime factors (672).

It is a congruent number.

It is an unprimeable number.

649974 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 694 + ... + 1334.

It is an arithmetic number, because the mean of its divisors is an integer number (58743).

2⁶⁴⁹⁹⁷⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649974, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (704916).

649974 is an abundant number, since it is smaller than the sum of its proper divisors (759858).

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

649974 is a wasteful number, since it uses less digits than its factorization.

649974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 659 counting only the distinct ones).

The product of its digits is 54432, while the sum is 39.

The square root of 649974 is about 806.2096501531. The cubic root of 649974 is about 86.6227555332.

The spelling of 649974 in words is "six hundred forty-nine thousand, nine hundred seventy-four".