1243973340 has 36 divisors (see below), whose sum is σ = 3773386344. Its totient is φ = 331726176.

The previous prime is 1243973323. The next prime is 1243973371. The reversal of 1243973340 is 433793421.

1243973340 is a `hidden beast` number, since 1 + 243 + 9 + 73 + 340 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 1243973295 and 1243973304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3455302 + ... + 3455661.

Almost surely, 2^1243973340 is an apocalyptic number.

1243973340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243973340 is an abundant number, since it is smaller than the sum of its proper divisors (2529413004).

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

1243973340 is a wasteful number, since it uses less digits than its factorization.

1243973340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6910978 (or 6910973 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 1243973340 is about 35270.0062375951. The cubic root of 1243973340 is about 1075.4833492530.

The spelling of 1243973340 in words is "one billion, two hundred forty-three million, nine hundred seventy-three thousand, three hundred forty".