391222272 has 264 divisors, whose sum is σ = 1276934976. Its totient is φ = 105971712.

The previous prime is 391222261. The next prime is 391222277. The reversal of 391222272 is 272222193.

It is a super-2 number, since 2×391222272² = 306109732217683968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391222277) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3462088 + ... + 3462200.

Almost surely, 2^391222272 is an apocalyptic number.

391222272 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391222272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (638467488).

391222272 is an abundant number, since it is smaller than the sum of its proper divisors (885712704).

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

391222272 is a wasteful number, since it uses less digits than its factorization.

391222272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 148 counting only the distinct ones).

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

The square root of 391222272 is about 19779.3395238567. The cubic root of 391222272 is about 731.3768173946.

The spelling of 391222272 in words is "three hundred ninety-one million, two hundred twenty-two thousand, two hundred seventy-two".