291384040 has 24 divisors (see below), whose sum is σ = 655857090. Its totient is φ = 116510432.

The previous prime is 291384031. The next prime is 291384077. The reversal of 291384040 is 40483192.

It can be written as a sum of positive squares in only one way, i.e., 262245636 + 29138404 = 16194^2 + 5398^2 .

It is a junction number, because it is equal to n+sod(n) for n = 291383993 and 291384011.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106611 + ... + 109309.

Almost surely, 2^291384040 is an apocalyptic number.

291384040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

291384040 is an abundant number, since it is smaller than the sum of its proper divisors (364473050).

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

291384040 is an frugal number, since it uses more digits than its factorization.

291384040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5409 (or 2706 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 291384040 is about 17069.9748095889. The cubic root of 291384040 is about 662.9619249133.

The spelling of 291384040 in words is "two hundred ninety-one million, three hundred eighty-four thousand, forty".