990421298 has 4 divisors (see below), whose sum is σ = 1485631950. Its totient is φ = 495210648.

The previous prime is 990421277. The next prime is 990421301. The reversal of 990421298 is 892124099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 892124099 = 487 ⋅1831877.

It can be written as a sum of positive squares in only one way, i.e., 594530689 + 395890609 = 24383^2 + 19897^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247605323 + ... + 247605326.

Almost surely, 2^990421298 is an apocalyptic number.

990421298 is a deficient number, since it is larger than the sum of its proper divisors (495210652).

990421298 is a wasteful number, since it uses less digits than its factorization.

990421298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495210651.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 990421298 is about 31470.9595976990. The cubic root of 990421298 is about 996.7968501191.

The spelling of 990421298 in words is "nine hundred ninety million, four hundred twenty-one thousand, two hundred ninety-eight".