1002155420 has 48 divisors (see below), whose sum is σ = 2461122048. Its totient is φ = 335603520.

The previous prime is 1002155419. The next prime is 1002155447. The reversal of 1002155420 is 245512001.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1002155392 and 1002155401.

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, 77216 + ... + 89255.

It is an arithmetic number, because the mean of its divisors is an integer number (51273376).

Almost surely, 2^1002155420 is an apocalyptic number.

1002155420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1002155420 is an abundant number, since it is smaller than the sum of its proper divisors (1458966628).

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

1002155420 is a wasteful number, since it uses less digits than its factorization.

1002155420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166530 (or 166528 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1002155420 is about 31656.8384397432. The cubic root of 1002155420 is about 1000.7179577466.

Adding to 1002155420 its reverse (245512001), we get a palindrome (1247667421).

The spelling of 1002155420 in words is "one billion, two million, one hundred fifty-five thousand, four hundred twenty".