391220748 has 18 divisors (see below), whose sum is σ = 988919204. Its totient is φ = 130406904.

The previous prime is 391220743. The next prime is 391220761. The reversal of 391220748 is 847022193.

391220748 is a `hidden beast` number, since 391 + 220 + 7 + 48 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×391220748³ (a number of 27 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 10867243 = 391220748 / (3 + 9 + 1 + 2 + 2 + 0 + 7 + 4 + 8).

It is not an unprimeable number, because it can be changed into a prime (391220741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5433586 + ... + 5433657.

Almost surely, 2^391220748 is an apocalyptic number.

It is an amenable number.

391220748 is an abundant number, since it is smaller than the sum of its proper divisors (597698456).

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

391220748 is a wasteful number, since it uses less digits than its factorization.

391220748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10867253 (or 10867248 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 391220748 is about 19779.3009987714. The cubic root of 391220748 is about 731.3758677046.

The spelling of 391220748 in words is "three hundred ninety-one million, two hundred twenty thousand, seven hundred forty-eight".