298540021 has 6 divisors (see below), whose sum is σ = 323271330. Its totient is φ = 275575248.

The previous prime is 298540003. The next prime is 298540051. The reversal of 298540021 is 120045892.

It can be written as a sum of positive squares in 3 ways, for example, as 4040100 + 294499921 = 2010^2 + 17161^2 .

It is not a de Polignac number, because 298540021 - 2¹¹ = 298537973 is a prime.

It is a super-2 number, since 2×298540021² = 178252288277360882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (298540051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 883086 + ... + 883423.

It is an arithmetic number, because the mean of its divisors is an integer number (53878555).

Almost surely, 2^298540021 is an apocalyptic number.

It is an amenable number.

298540021 is a deficient number, since it is larger than the sum of its proper divisors (24731309).

298540021 is a wasteful number, since it uses less digits than its factorization.

298540021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766535 (or 1766522 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 298540021 is about 17278.3107102517. The cubic root of 298540021 is about 668.3452302836.

The spelling of 298540021 in words is "two hundred ninety-eight million, five hundred forty thousand, twenty-one".