391421552 has 20 divisors (see below), whose sum is σ = 760575576. Its totient is φ = 195144000.

The previous prime is 391421551. The next prime is 391421573. The reversal of 391421552 is 255124193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391421551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29699 + ... + 40802.

Almost surely, 2^391421552 is an apocalyptic number.

It is an amenable number.

391421552 is a deficient number, since it is larger than the sum of its proper divisors (369154024).

391421552 is a wasteful number, since it uses less digits than its factorization.

391421552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70856 (or 70850 counting only the distinct ones).

The product of its digits is 10800, while the sum is 32.

The square root of 391421552 is about 19784.3764622492. The cubic root of 391421552 is about 731.5009787240.

The spelling of 391421552 in words is "three hundred ninety-one million, four hundred twenty-one thousand, five hundred fifty-two".