1645157934 has 48 divisors (see below), whose sum is σ = 4090844160. Its totient is φ = 468069840.

The previous prime is 1645157933. The next prime is 1645157939. The reversal of 1645157934 is 4397515461.

1645157934 is a `hidden beast` number, since 1 + 6 + 45 + 1 + 579 + 34 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1645157934.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645157933) 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, 2799 + ... + 57429.

It is an arithmetic number, because the mean of its divisors is an integer number (85225920).

Almost surely, 2^1645157934 is an apocalyptic number.

1645157934 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645157934, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2045422080).

1645157934 is an abundant number, since it is smaller than the sum of its proper divisors (2445686226).

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

1645157934 is a wasteful number, since it uses less digits than its factorization.

1645157934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54885 (or 54882 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 1645157934 is about 40560.5465199866. The cubic root of 1645157934 is about 1180.5087182172.

The spelling of 1645157934 in words is "one billion, six hundred forty-five million, one hundred fifty-seven thousand, nine hundred thirty-four".