1977378 has 32 divisors (see below), whose sum is σ = 4318272. Its totient is φ = 600000.

The previous prime is 1977361. The next prime is 1977403. The reversal of 1977378 is 8737791.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7753 + ... + 8003.

It is an arithmetic number, because the mean of its divisors is an integer number (134946).

2^1977378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1977378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2159136).

1977378 is an abundant number, since it is smaller than the sum of its proper divisors (2340894).

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

1977378 is a wasteful number, since it uses less digits than its factorization.

1977378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370.

The product of its digits is 74088, while the sum is 42.

The square root of 1977378 is about 1406.1927321673. The cubic root of 1977378 is about 125.5152703862.

The spelling of 1977378 in words is "one million, nine hundred seventy-seven thousand, three hundred seventy-eight".