391770252 has 36 divisors (see below), whose sum is σ = 1014465816. Its totient is φ = 127404480.

The previous prime is 391770229. The next prime is 391770259. The reversal of 391770252 is 252077193.

It is a tau number, because it is divible by the number of its divisors (36).

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).

It is not an unprimeable number, because it can be changed into a prime (391770259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131238 + ... + 134189.

It is an arithmetic number, because the mean of its divisors is an integer number (28179606).

Almost surely, 2^391770252 is an apocalyptic number.

It is an amenable number.

391770252 is an abundant number, since it is smaller than the sum of its proper divisors (622695564).

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

391770252 is a wasteful number, since it uses less digits than its factorization.

391770252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265478 (or 265473 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 391770252 is about 19793.1870096758. The cubic root of 391770252 is about 731.7181347822.

The spelling of 391770252 in words is "three hundred ninety-one million, seven hundred seventy thousand, two hundred fifty-two".