1978154 has 16 divisors (see below), whose sum is σ = 3188808. Its totient is φ = 916992.

The previous prime is 1978153. The next prime is 1978157. The reversal of 1978154 is 4518791.

It can be written as a sum of positive squares in 4 ways, for example, as 1885129 + 93025 = 1373^2 + 305^2 .

It is not an unprimeable number, because it can be changed into a prime (1978153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2084 + ... + 2880.

2^1978154 is an apocalyptic number.

1978154 is a deficient number, since it is larger than the sum of its proper divisors (1210654).

1978154 is a wasteful number, since it uses less digits than its factorization.

1978154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889.

The product of its digits is 10080, while the sum is 35.

The square root of 1978154 is about 1406.4686274496. The cubic root of 1978154 is about 125.5316872628.

The spelling of 1978154 in words is "one million, nine hundred seventy-eight thousand, one hundred fifty-four".