1961923378 has 4 divisors (see below), whose sum is σ = 2942885070. Its totient is φ = 980961688.

The previous prime is 1961923363. The next prime is 1961923417. The reversal of 1961923378 is 8733291691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1391812249 + 570111129 = 37307^2 + 23877^2 .

It is a super-2 number, since 2×1961923378² = 7698286682285861768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490480843 + ... + 490480846.

Almost surely, 2^1961923378 is an apocalyptic number.

1961923378 is a deficient number, since it is larger than the sum of its proper divisors (980961692).

1961923378 is an equidigital number, since it uses as much as digits as its factorization.

1961923378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980961691.

The product of its digits is 489888, while the sum is 49.

The square root of 1961923378 is about 44293.6042561452. The cubic root of 1961923378 is about 1251.8741758741.

The spelling of 1961923378 in words is "one billion, nine hundred sixty-one million, nine hundred twenty-three thousand, three hundred seventy-eight".