291423980 has 24 divisors (see below), whose sum is σ = 615202560. Its totient is φ = 115957760.

The previous prime is 291423947. The next prime is 291423983. The reversal of 291423980 is 89324192.

It is a super-2 number, since 2×291423980² = 169855872238080800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (291423983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34325 + ... + 41964.

It is an arithmetic number, because the mean of its divisors is an integer number (25633440).

Almost surely, 2^291423980 is an apocalyptic number.

291423980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

291423980 is an abundant number, since it is smaller than the sum of its proper divisors (323778580).

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

291423980 is a wasteful number, since it uses less digits than its factorization.

291423980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76489 (or 76487 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 291423980 is about 17071.1446599225. The cubic root of 291423980 is about 662.9922142519.

The spelling of 291423980 in words is "two hundred ninety-one million, four hundred twenty-three thousand, nine hundred eighty".