1948377781 has 8 divisors (see below), whose sum is σ = 2343913280. Its totient is φ = 1582141248.

The previous prime is 1948377779. The next prime is 1948377797. The reversal of 1948377781 is 1877738491.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1948377781 - 2¹ = 1948377779 is a prime.

It is a super-2 number, since 2×1948377781² = 7592351954988967922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1948377581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7324596 + ... + 7324861.

It is an arithmetic number, because the mean of its divisors is an integer number (292989160).

Almost surely, 2^1948377781 is an apocalyptic number.

It is an amenable number.

1948377781 is a deficient number, since it is larger than the sum of its proper divisors (395535499).

1948377781 is a wasteful number, since it uses less digits than its factorization.

1948377781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14649483.

The product of its digits is 2370816, while the sum is 55.

The square root of 1948377781 is about 44140.4324967484. The cubic root of 1948377781 is about 1248.9864383230.

The spelling of 1948377781 in words is "one billion, nine hundred forty-eight million, three hundred seventy-seven thousand, seven hundred eighty-one".