1101978 has 16 divisors (see below), whose sum is σ = 2448960. Its totient is φ = 367308.

The previous prime is 1101967. The next prime is 1102001. The reversal of 1101978 is 8791011.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10150 + ... + 10257.

It is an arithmetic number, because the mean of its divisors is an integer number (153060).

2^1101978 is an apocalyptic number.

1101978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1101978 is an abundant number, since it is smaller than the sum of its proper divisors (1346982).

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

1101978 is a wasteful number, since it uses less digits than its factorization.

1101978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20418 (or 20412 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 27.

The square root of 1101978 is about 1049.7513991417. The cubic root of 1101978 is about 103.2898487401.

Adding to 1101978 its reverse (8791011), we get a palindrome (9892989).

It can be divided in two parts, 1101 and 978, that multiplied together give a triangular number (1076778 = T₁₄₆₇).

The spelling of 1101978 in words is "one million, one hundred one thousand, nine hundred seventy-eight".