1272621406 has 64 divisors (see below), whose sum is σ = 2359134720. Its totient is φ = 502796160.

The previous prime is 1272621353. The next prime is 1272621409. The reversal of 1272621406 is 6041262721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272621409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1735816 + ... + 1736548.

It is an arithmetic number, because the mean of its divisors is an integer number (36861480).

Almost surely, 2^1272621406 is an apocalyptic number.

1272621406 is a deficient number, since it is larger than the sum of its proper divisors (1086513314).

1272621406 is a wasteful number, since it uses less digits than its factorization.

1272621406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 1272621406 is about 35673.8196160714. The cubic root of 1272621406 is about 1083.6767138912.

The spelling of 1272621406 in words is "one billion, two hundred seventy-two million, six hundred twenty-one thousand, four hundred six".