3719921645 has 16 divisors (see below), whose sum is σ = 4887838080. Its totient is φ = 2695329600.

The previous prime is 3719921641. The next prime is 3719921683. The reversal of 3719921645 is 5461299173.

It is not a de Polignac number, because 3719921645 - 2² = 3719921641 is a prime.

It is a super-3 number, since 3×3719921645³ (a number of 30 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3719921645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3719921641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110921 + ... + 140510.

It is an arithmetic number, because the mean of its divisors is an integer number (305489880).

Almost surely, 2^3719921645 is an apocalyptic number.

It is an amenable number.

3719921645 is a deficient number, since it is larger than the sum of its proper divisors (1167916435).

3719921645 is a wasteful number, since it uses less digits than its factorization.

3719921645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251716.

The product of its digits is 408240, while the sum is 47.

The square root of 3719921645 is about 60991.1603841081. The cubic root of 3719921645 is about 1549.4513000600.

The spelling of 3719921645 in words is "three billion, seven hundred nineteen million, nine hundred twenty-one thousand, six hundred forty-five".