1990149954 has 32 divisors (see below), whose sum is σ = 4317788160. Its totient is φ = 607880832.

The previous prime is 1990149923. The next prime is 1990149971. The reversal of 1990149954 is 4599410991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1990149897 and 1990149906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82434 + ... + 103805.

It is an arithmetic number, because the mean of its divisors is an integer number (134930880).

Almost surely, 2^1990149954 is an apocalyptic number.

1990149954 is an abundant number, since it is smaller than the sum of its proper divisors (2327638206).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1990149954 is a wasteful number, since it uses less digits than its factorization.

1990149954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186394.

The product of its (nonzero) digits is 524880, while the sum is 51.

The square root of 1990149954 is about 44611.0967585420. The cubic root of 1990149954 is about 1257.8492649174.

The spelling of 1990149954 in words is "one billion, nine hundred ninety million, one hundred forty-nine thousand, nine hundred fifty-four".