990148774 has 4 divisors (see below), whose sum is σ = 1485223164. Its totient is φ = 495074386.

The previous prime is 990148771. The next prime is 990148787. The reversal of 990148774 is 477841099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 477841099 = 31 ⋅15414229.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990148771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247537192 + ... + 247537195.

It is an arithmetic number, because the mean of its divisors is an integer number (371305791).

Almost surely, 2^990148774 is an apocalyptic number.

990148774 is a deficient number, since it is larger than the sum of its proper divisors (495074390).

990148774 is a wasteful number, since it uses less digits than its factorization.

990148774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495074389.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 990148774 is about 31466.6295303453. The cubic root of 990148774 is about 996.7054156340.

The spelling of 990148774 in words is "nine hundred ninety million, one hundred forty-eight thousand, seven hundred seventy-four".