1215020 has 24 divisors (see below), whose sum is σ = 2587200. Its totient is φ = 479232.

The previous prime is 1215017. The next prime is 1215029. The reversal of 1215020 is 205121.

1215020 is nontrivially palindromic in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 1214992 and 1215010.

It is not an unprimeable number, because it can be changed into a prime (1215029) 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, 1196 + ... + 1964.

It is an arithmetic number, because the mean of its divisors is an integer number (107800).

2^1215020 is an apocalyptic number.

1215020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215020 is an abundant number, since it is smaller than the sum of its proper divisors (1372180).

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

1215020 is a wasteful number, since it uses less digits than its factorization.

1215020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857 (or 855 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 1215020 is about 1102.2794563993. The cubic root of 1215020 is about 106.7073846283.

The spelling of 1215020 in words is "one million, two hundred fifteen thousand, twenty".