291387042 has 24 divisors (see below), whose sum is σ = 651705600. Its totient is φ = 93995640.

The previous prime is 291387029. The next prime is 291387043. The reversal of 291387042 is 240783192.

It is a junction number, because it is equal to n+sod(n) for n = 291386988 and 291387006.

It is not an unprimeable number, because it can be changed into a prime (291387043) 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, 260542 + ... + 261657.

It is an arithmetic number, because the mean of its divisors is an integer number (27154400).

Almost surely, 2^291387042 is an apocalyptic number.

291387042 is an abundant number, since it is smaller than the sum of its proper divisors (360318558).

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

291387042 is a wasteful number, since it uses less digits than its factorization.

291387042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522238 (or 522235 counting only the distinct ones).

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

The square root of 291387042 is about 17070.0627415367. The cubic root of 291387042 is about 662.9642016393.

The spelling of 291387042 in words is "two hundred ninety-one million, three hundred eighty-seven thousand, forty-two".