2491378 has 4 divisors (see below), whose sum is σ = 3737070. Its totient is φ = 1245688.

The previous prime is 2491369. The next prime is 2491381. The reversal of 2491378 is 8731942.

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., 2064969 + 426409 = 1437^2 + 653^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622843 + ... + 622846.

2^2491378 is an apocalyptic number.

2491378 is a deficient number, since it is larger than the sum of its proper divisors (1245692).

2491378 is a wasteful number, since it uses less digits than its factorization.

2491378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245691.

The product of its digits is 12096, while the sum is 34.

The square root of 2491378 is about 1578.4099594212. The cubic root of 2491378 is about 135.5646763947.

The spelling of 2491378 in words is "two million, four hundred ninety-one thousand, three hundred seventy-eight".