1648940465 has 8 divisors (see below), whose sum is σ = 1990578240. Its totient is φ = 1311252592.

The previous prime is 1648940429. The next prime is 1648940477. The reversal of 1648940465 is 5640498461.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1648940465 - 2²² = 1644746161 is a prime.

It is a super-2 number, since 2×1648940465² = 5438009314228832450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 986555 + ... + 988224.

It is an arithmetic number, because the mean of its divisors is an integer number (248822280).

Almost surely, 2^1648940465 is an apocalyptic number.

It is an amenable number.

1648940465 is a deficient number, since it is larger than the sum of its proper divisors (341637775).

1648940465 is a wasteful number, since it uses less digits than its factorization.

1648940465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1974951.

The product of its (nonzero) digits is 829440, while the sum is 47.

The square root of 1648940465 is about 40607.1479545166. The cubic root of 1648940465 is about 1181.4127637387.

The spelling of 1648940465 in words is "one billion, six hundred forty-eight million, nine hundred forty thousand, four hundred sixty-five".