2691378 has 12 divisors (see below), whose sum is σ = 5831358. Its totient is φ = 897120.

The previous prime is 2691373. The next prime is 2691401. The reversal of 2691378 is 8731962.

It can be written as a sum of positive squares in only one way, i.e., 1595169 + 1096209 = 1263^2 + 1047^2 .

It is not an unprimeable number, because it can be changed into a prime (2691373) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74743 + ... + 74778.

2^2691378 is an apocalyptic number.

2691378 is an abundant number, since it is smaller than the sum of its proper divisors (3139980).

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

2691378 is a wasteful number, since it uses less digits than its factorization.

2691378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149529 (or 149526 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 2691378 is about 1640.5419836140. The cubic root of 2691378 is about 139.0992855510.

The spelling of 2691378 in words is "two million, six hundred ninety-one thousand, three hundred seventy-eight".