291438142 has 8 divisors (see below), whose sum is σ = 437380632. Its totient is φ = 145644600.

The previous prime is 291438109. The next prime is 291438143. The reversal of 291438142 is 241834192.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×291438142² = 169872381224824328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 291438098 and 291438107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291438143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32209 + ... + 40252.

It is an arithmetic number, because the mean of its divisors is an integer number (54672579).

Almost surely, 2^291438142 is an apocalyptic number.

291438142 is a deficient number, since it is larger than the sum of its proper divisors (145942490).

291438142 is a wasteful number, since it uses less digits than its factorization.

291438142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74474.

The product of its digits is 13824, while the sum is 34.

The square root of 291438142 is about 17071.5594483925. The cubic root of 291438142 is about 663.0029536377.

The spelling of 291438142 in words is "two hundred ninety-one million, four hundred thirty-eight thousand, one hundred forty-two".