1649189707 has 18 divisors (see below), whose sum is σ = 1858203116. Its totient is φ = 1461795720.

The previous prime is 1649189671. The next prime is 1649189747. The reversal of 1649189707 is 7079819461.

It is not a de Polignac number, because 1649189707 - 2¹⁵ = 1649156939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1649189747) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2929008 + ... + 2929570.

Almost surely, 2^1649189707 is an apocalyptic number.

1649189707 is a deficient number, since it is larger than the sum of its proper divisors (209013409).

1649189707 is an frugal number, since it uses more digits than its factorization.

1649189707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 52.

The square root of 1649189707 is about 40610.2167810023. The cubic root of 1649189707 is about 1181.4722853632.

The spelling of 1649189707 in words is "one billion, six hundred forty-nine million, one hundred eighty-nine thousand, seven hundred seven".