1243842172 has 12 divisors (see below), whose sum is σ = 2235554440. Its totient is φ = 605112336.

The previous prime is 1243842167. The next prime is 1243842217. The reversal of 1243842172 is 2712483421.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4202022 + ... + 4202317.

Almost surely, 2^1243842172 is an apocalyptic number.

It is an amenable number.

1243842172 is a deficient number, since it is larger than the sum of its proper divisors (991712268).

1243842172 is a wasteful number, since it uses less digits than its factorization.

1243842172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8404380 (or 8404378 counting only the distinct ones).

The product of its digits is 21504, while the sum is 34.

The square root of 1243842172 is about 35268.1467049234. The cubic root of 1243842172 is about 1075.4455472750.

The spelling of 1243842172 in words is "one billion, two hundred forty-three million, eight hundred forty-two thousand, one hundred seventy-two".