540821698 has 4 divisors (see below), whose sum is σ = 811232550. Its totient is φ = 270410848.

The previous prime is 540821683. The next prime is 540821713. The reversal of 540821698 is 896128045.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 896128045 = 5 ⋅179225609.

It is an interprime number because it is at equal distance from previous prime (540821683) and next prime (540821713).

It can be written as a sum of positive squares in only one way, i.e., 432099369 + 108722329 = 20787^2 + 10427^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135205423 + ... + 135205426.

Almost surely, 2^540821698 is an apocalyptic number.

540821698 is a deficient number, since it is larger than the sum of its proper divisors (270410852).

540821698 is a wasteful number, since it uses less digits than its factorization.

540821698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270410851.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 540821698 is about 23255.5734825009. The cubic root of 540821698 is about 814.7381185267.

The spelling of 540821698 in words is "five hundred forty million, eight hundred twenty-one thousand, six hundred ninety-eight".