990892381274 has 4 divisors (see below), whose sum is σ = 1486338571914. Its totient is φ = 495446190636.

The previous prime is 990892381273. The next prime is 990892381277. The reversal of 990892381274 is 472183298099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 472183298099 = 23 ⋅20529708613.

It can be written as a sum of positive squares in only one way, i.e., 756912180049 + 233980201225 = 870007^2 + 483715^2 .

It is a super-2 number, since 2×990892381274² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (990892381273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247723095317 + ... + 247723095320.

Almost surely, 2^990892381274 is an apocalyptic number.

990892381274 is a deficient number, since it is larger than the sum of its proper divisors (495446190640).

990892381274 is a wasteful number, since it uses less digits than its factorization.

990892381274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495446190639.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 990892381274 in words is "nine hundred ninety billion, eight hundred ninety-two million, three hundred eighty-one thousand, two hundred seventy-four".