1649394725 has 24 divisors (see below), whose sum is σ = 2256284160. Its totient is φ = 1186064000.

The previous prime is 1649394709. The next prime is 1649394727. The reversal of 1649394725 is 5274939461.

It is not a de Polignac number, because 1649394725 - 2⁴ = 1649394709 is a prime.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649394727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9221 + ... + 58170.

It is an arithmetic number, because the mean of its divisors is an integer number (94011840).

Almost surely, 2^1649394725 is an apocalyptic number.

It is an amenable number.

1649394725 is a deficient number, since it is larger than the sum of its proper divisors (606889435).

1649394725 is a wasteful number, since it uses less digits than its factorization.

1649394725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67501 (or 67496 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 50.

The square root of 1649394725 is about 40612.7409195686. The cubic root of 1649394725 is about 1181.5212413338.

The spelling of 1649394725 in words is "one billion, six hundred forty-nine million, three hundred ninety-four thousand, seven hundred twenty-five".