1491126378 has 16 divisors (see below), whose sum is σ = 3408288960. Its totient is φ = 426036096.

The previous prime is 1491126367. The next prime is 1491126407. The reversal of 1491126378 is 8736211941.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 35503009 = 1491126378 / (1 + 4 + 9 + 1 + 1 + 2 + 6 + 3 + 7 + 8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17751463 + ... + 17751546.

It is an arithmetic number, because the mean of its divisors is an integer number (213018060).

Almost surely, 2^1491126378 is an apocalyptic number.

1491126378 is an abundant number, since it is smaller than the sum of its proper divisors (1917162582).

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

1491126378 is a wasteful number, since it uses less digits than its factorization.

1491126378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35503021.

The product of its digits is 72576, while the sum is 42.

The square root of 1491126378 is about 38615.1055676402. The cubic root of 1491126378 is about 1142.4524963690.

The spelling of 1491126378 in words is "one billion, four hundred ninety-one million, one hundred twenty-six thousand, three hundred seventy-eight".