2991402478 has 4 divisors (see below), whose sum is σ = 4487103720. Its totient is φ = 1495701238.

The previous prime is 2991402473. The next prime is 2991402481. The reversal of 2991402478 is 8742041992.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2991402473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 747850618 + ... + 747850621.

It is an arithmetic number, because the mean of its divisors is an integer number (1121775930).

Almost surely, 2^2991402478 is an apocalyptic number.

2991402478 is a deficient number, since it is larger than the sum of its proper divisors (1495701242).

2991402478 is a wasteful number, since it uses less digits than its factorization.

2991402478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495701241.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 2991402478 is about 54693.7151599706. The cubic root of 2991402478 is about 1440.8704995782.

The spelling of 2991402478 in words is "two billion, nine hundred ninety-one million, four hundred two thousand, four hundred seventy-eight".