308402220 has 48 divisors (see below), whose sum is σ = 986888448. Its totient is φ = 70491840.

The previous prime is 308402209. The next prime is 308402221. The reversal of 308402220 is 22204803.

It is a super-2 number, since 2×308402220² = 190223858601856800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (308402221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 366726 + ... + 367565.

It is an arithmetic number, because the mean of its divisors is an integer number (20560176).

Almost surely, 2^308402220 is an apocalyptic number.

308402220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

308402220 is an abundant number, since it is smaller than the sum of its proper divisors (678486228).

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

308402220 is a wasteful number, since it uses less digits than its factorization.

308402220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734310 (or 734308 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 308402220 is about 17561.3843417881. The cubic root of 308402220 is about 675.6251875740.

The spelling of 308402220 in words is "three hundred eight million, four hundred two thousand, two hundred twenty".