1219256830 has 128 divisors (see below), whose sum is σ = 2648194560. Its totient is φ = 399114240.

The previous prime is 1219256791. The next prime is 1219256839. The reversal of 1219256830 is 386529121.

It is a self number, because there is not a number n which added to its sum of digits gives 1219256830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219256839) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4744062 + ... + 4744318.

It is an arithmetic number, because the mean of its divisors is an integer number (20689020).

Almost surely, 2^1219256830 is an apocalyptic number.

1219256830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1219256830 is an abundant number, since it is smaller than the sum of its proper divisors (1428937730).

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

1219256830 is a wasteful number, since it uses less digits than its factorization.

1219256830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 1219256830 is about 34917.8583249317. The cubic root of 1219256830 is about 1068.3127190731.

The spelling of 1219256830 in words is "one billion, two hundred nineteen million, two hundred fifty-six thousand, eight hundred thirty".