1371643812 has 144 divisors (see below), whose sum is σ = 4350108672. Its totient is φ = 354018240.

The previous prime is 1371643811. The next prime is 1371643813. The reversal of 1371643812 is 2183461731.

It is a happy number.

1371643812 is a `hidden beast` number, since 1 + 3 + 7 + 1 + 643 + 8 + 1 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (1371643811) and next prime (1371643813).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1371643811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 461443 + ... + 464405.

It is an arithmetic number, because the mean of its divisors is an integer number (30209088).

Almost surely, 2^1371643812 is an apocalyptic number.

1371643812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1371643812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2175054336).

1371643812 is an abundant number, since it is smaller than the sum of its proper divisors (2978464860).

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

1371643812 is a wasteful number, since it uses less digits than its factorization.

1371643812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3158 (or 3153 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 1371643812 is about 37035.7099567431. The cubic root of 1371643812 is about 1111.0845693467.

The spelling of 1371643812 in words is "one billion, three hundred seventy-one million, six hundred forty-three thousand, eight hundred twelve".