1601749640 has 16 divisors (see below), whose sum is σ = 3603936780. Its totient is φ = 640699840.

The previous prime is 1601749627. The next prime is 1601749717. The reversal of 1601749640 is 469471061.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1556618116 + 45131524 = 39454^2 + 6718^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1601749594 and 1601749603.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20021831 + ... + 20021910.

Almost surely, 2^1601749640 is an apocalyptic number.

1601749640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1601749640 is an abundant number, since it is smaller than the sum of its proper divisors (2002187140).

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

1601749640 is a wasteful number, since it uses less digits than its factorization.

1601749640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40043752 (or 40043748 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1601749640 is about 40021.8645242822. The cubic root of 1601749640 is about 1170.0332715110.

The spelling of 1601749640 in words is "one billion, six hundred one million, seven hundred forty-nine thousand, six hundred forty".