1304279220 has 24 divisors (see below), whose sum is σ = 3651981984. Its totient is φ = 347807776.

The previous prime is 1304279209. The next prime is 1304279257. The reversal of 1304279220 is 229724031.

It is a super-2 number, since 2×1304279220² = 3402288567447616800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 10868934 + ... + 10869053.

It is an arithmetic number, because the mean of its divisors is an integer number (152165916).

Almost surely, 2^1304279220 is an apocalyptic number.

1304279220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1304279220 is an abundant number, since it is smaller than the sum of its proper divisors (2347702764).

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

1304279220 is a wasteful number, since it uses less digits than its factorization.

1304279220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21737999 (or 21737997 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 1304279220 is about 36114.8061049758. The cubic root of 1304279220 is about 1092.5890869513.

The spelling of 1304279220 in words is "one billion, three hundred four million, two hundred seventy-nine thousand, two hundred twenty".