1097780 has 24 divisors (see below), whose sum is σ = 2328480. Its totient is φ = 434720.

The previous prime is 1097743. The next prime is 1097783. The reversal of 1097780 is 877901.

1097780 = T₂₁₄ + T₂₁₅ + ... + T₂₅₃.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1097783) 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, 2411 + ... + 2829.

It is an arithmetic number, because the mean of its divisors is an integer number (97020).

2^1097780 is an apocalyptic number.

1097780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1097780 is an abundant number, since it is smaller than the sum of its proper divisors (1230700).

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

1097780 is a wasteful number, since it uses less digits than its factorization.

1097780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559 (or 557 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 1097780 is about 1047.7499701742. The cubic root of 1097780 is about 103.1585204774.

The spelling of 1097780 in words is "one million, ninety-seven thousand, seven hundred eighty".