1245155520 has 112 divisors (see below), whose sum is σ = 4518160128. Its totient is φ = 284605440.

The previous prime is 1245155503. The next prime is 1245155543. The reversal of 1245155520 is 255515421.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 85926 + ... + 99365.

Almost surely, 2^1245155520 is an apocalyptic number.

1245155520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245155520 is an abundant number, since it is smaller than the sum of its proper divisors (3273004608).

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

1245155520 is a wasteful number, since it uses less digits than its factorization.

1245155520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185318 (or 185308 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

The square root of 1245155520 is about 35286.7612568793. The cubic root of 1245155520 is about 1075.8239279253.

The spelling of 1245155520 in words is "one billion, two hundred forty-five million, one hundred fifty-five thousand, five hundred twenty".