1242520400 has 60 divisors (see below), whose sum is σ = 3256544544. Its totient is φ = 451824000.

The previous prime is 1242520343. The next prime is 1242520469. The reversal of 1242520400 is 40252421.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136796 + ... + 145595.

Almost surely, 2^1242520400 is an apocalyptic number.

1242520400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242520400 is an abundant number, since it is smaller than the sum of its proper divisors (2014024144).

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

1242520400 is a wasteful number, since it uses less digits than its factorization.

1242520400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282420 (or 282409 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 1242520400 is about 35249.4028318211. The cubic root of 1242520400 is about 1075.0644706242.

Adding to 1242520400 its reverse (40252421), we get a palindrome (1282772821).

The spelling of 1242520400 in words is "one billion, two hundred forty-two million, five hundred twenty thousand, four hundred".