1272356906 has 4 divisors (see below), whose sum is σ = 1908535362. Its totient is φ = 636178452.

The previous prime is 1272356887. The next prime is 1272356909. The reversal of 1272356906 is 6096532721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6096532721 = 113 ⋅53951617.

It can be written as a sum of positive squares in only one way, i.e., 736851025 + 535505881 = 27145^2 + 23141^2 .

It is not an unprimeable number, because it can be changed into a prime (1272356909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318089225 + ... + 318089228.

Almost surely, 2^1272356906 is an apocalyptic number.

1272356906 is a deficient number, since it is larger than the sum of its proper divisors (636178456).

1272356906 is an equidigital number, since it uses as much as digits as its factorization.

1272356906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636178455.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 1272356906 is about 35670.1122229802. The cubic root of 1272356906 is about 1083.6016320301.

The spelling of 1272356906 in words is "one billion, two hundred seventy-two million, three hundred fifty-six thousand, nine hundred six".