378919491 has 4 divisors (see below), whose sum is σ = 505225992. Its totient is φ = 252612992.

The previous prime is 378919487. The next prime is 378919501. The reversal of 378919491 is 194919873.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194919873 = 3 ⋅64973291.

It is a cyclic number.

It is not a de Polignac number, because 378919491 - 2² = 378919487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (378919441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63153246 + ... + 63153251.

It is an arithmetic number, because the mean of its divisors is an integer number (126306498).

Almost surely, 2^378919491 is an apocalyptic number.

378919491 is a deficient number, since it is larger than the sum of its proper divisors (126306501).

378919491 is a wasteful number, since it uses less digits than its factorization.

378919491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126306500.

The product of its digits is 489888, while the sum is 51.

The square root of 378919491 is about 19465.8544893359. The cubic root of 378919491 is about 723.6284754542.

The spelling of 378919491 in words is "three hundred seventy-eight million, nine hundred nineteen thousand, four hundred ninety-one".