1012155420 has 48 divisors (see below), whose sum is σ = 2835624960. Its totient is φ = 269756736.

The previous prime is 1012155407. The next prime is 1012155427. The reversal of 1012155420 is 245512101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012155427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139441 + ... + 146519.

It is an arithmetic number, because the mean of its divisors is an integer number (59075520).

Almost surely, 2^1012155420 is an apocalyptic number.

1012155420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012155420 is an abundant number, since it is smaller than the sum of its proper divisors (1823469540).

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

1012155420 is a wasteful number, since it uses less digits than its factorization.

1012155420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9474 (or 9472 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1012155420 is about 31814.3901403123. The cubic root of 1012155420 is about 1004.0354995040.

Adding to 1012155420 its reverse (245512101), we get a palindrome (1257667521).

The spelling of 1012155420 in words is "one billion, twelve million, one hundred fifty-five thousand, four hundred twenty".