391242492 has 18 divisors (see below), whose sum is σ = 988974168. Its totient is φ = 130414152.

The previous prime is 391242479. The next prime is 391242497. The reversal of 391242492 is 294242193.

391242492 is a `hidden beast` number, since 391 + 24 + 249 + 2 = 666.

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

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: 10867847 = 391242492 / (3 + 9 + 1 + 2 + 4 + 2 + 4 + 9 + 2).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391242497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5433888 + ... + 5433959.

Almost surely, 2^391242492 is an apocalyptic number.

It is an amenable number.

391242492 is an abundant number, since it is smaller than the sum of its proper divisors (597731676).

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

391242492 is a wasteful number, since it uses less digits than its factorization.

391242492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10867857 (or 10867852 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 391242492 is about 19779.8506566657. The cubic root of 391242492 is about 731.3894173798.

It can be divided in two parts, 39124 and 2492, that added together give a triangular number (41616 = T₂₈₈).

The spelling of 391242492 in words is "three hundred ninety-one million, two hundred forty-two thousand, four hundred ninety-two".