1229156894 has 16 divisors (see below), whose sum is σ = 2107816800. Its totient is φ = 526608864.

The previous prime is 1229156881. The next prime is 1229156923. The reversal of 1229156894 is 4986519221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35912 + ... + 61220.

It is an arithmetic number, because the mean of its divisors is an integer number (131738550).

Almost surely, 2^1229156894 is an apocalyptic number.

1229156894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1229156894 is a deficient number, since it is larger than the sum of its proper divisors (878659906).

1229156894 is a wasteful number, since it uses less digits than its factorization.

1229156894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28787.

The product of its digits is 311040, while the sum is 47.

The square root of 1229156894 is about 35059.3339069641. Note that the first 3 decimals coincide. The cubic root of 1229156894 is about 1071.1964065363.

The spelling of 1229156894 in words is "one billion, two hundred twenty-nine million, one hundred fifty-six thousand, eight hundred ninety-four".