1669249740 has 48 divisors (see below), whose sum is σ = 4681081440. Its totient is φ = 444449280.

The previous prime is 1669249717. The next prime is 1669249741. The reversal of 1669249740 is 479429661.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1669249740.

It is not an unprimeable number, because it can be changed into a prime (1669249741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18616 + ... + 60704.

It is an arithmetic number, because the mean of its divisors is an integer number (97522530).

Almost surely, 2^1669249740 is an apocalyptic number.

1669249740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1669249740 is an abundant number, since it is smaller than the sum of its proper divisors (3011831700).

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

1669249740 is a wasteful number, since it uses less digits than its factorization.

1669249740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42762 (or 42760 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 48.

The square root of 1669249740 is about 40856.4528563114. The cubic root of 1669249740 is about 1186.2432997512.

The spelling of 1669249740 in words is "one billion, six hundred sixty-nine million, two hundred forty-nine thousand, seven hundred forty".