1971138950 has 72 divisors (see below), whose sum is σ = 4249074024. Its totient is φ = 674560000.

The previous prime is 1971138943. The next prime is 1971138973. The reversal of 1971138950 is 598311791.

It is a congruent number.

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 35 ways as a sum of consecutive naturals, for example, 152750 + ... + 165150.

It is an arithmetic number, because the mean of its divisors is an integer number (59014917).

Almost surely, 2^1971138950 is an apocalyptic number.

1971138950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1971138950 is an abundant number, since it is smaller than the sum of its proper divisors (2277935074).

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

1971138950 is a wasteful number, since it uses less digits than its factorization.

1971138950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12458 (or 12436 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 44.

The square root of 1971138950 is about 44397.5106284125. The cubic root of 1971138950 is about 1253.8312213971.

The spelling of 1971138950 in words is "one billion, nine hundred seventy-one million, one hundred thirty-eight thousand, nine hundred fifty".