3949191751378 has 8 divisors (see below), whose sum is σ = 5926058155260. Its totient is φ = 1973839032960.

The previous prime is 3949191751357. The next prime is 3949191751387. The reversal of 3949191751378 is 8731571919493.

It can be written as a sum of positive squares in 2 ways, for example, as 3892622458729 + 56569292649 = 1972973^2 + 237843^2 .

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

It is a super-2 number, since 2×3949191751378² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378414843 + ... + 378425278.

Almost surely, 2^{3949191751378} is an apocalyptic number.

3949191751378 is a deficient number, since it is larger than the sum of its proper divisors (1976866403882).

3949191751378 is a wasteful number, since it uses less digits than its factorization.

3949191751378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756842732.

The product of its digits is 51438240, while the sum is 67.

The spelling of 3949191751378 in words is "three trillion, nine hundred forty-nine billion, one hundred ninety-one million, seven hundred fifty-one thousand, three hundred seventy-eight".