1649471973 has 8 divisors (see below), whose sum is σ = 2220648768. Its totient is φ = 1088971584.

The previous prime is 1649471939. The next prime is 1649472001. The reversal of 1649471973 is 3791749461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1649471973 - 2¹⁴ = 1649455589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649470973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2668740 + ... + 2669357.

It is an arithmetic number, because the mean of its divisors is an integer number (277581096).

Almost surely, 2^1649471973 is an apocalyptic number.

It is an amenable number.

1649471973 is a deficient number, since it is larger than the sum of its proper divisors (571176795).

1649471973 is a wasteful number, since it uses less digits than its factorization.

1649471973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5338203.

The product of its digits is 1143072, while the sum is 51.

The square root of 1649471973 is about 40613.6919400342. The cubic root of 1649471973 is about 1181.5396862268.

The spelling of 1649471973 in words is "one billion, six hundred forty-nine million, four hundred seventy-one thousand, nine hundred seventy-three".