1242257250 has 128 divisors (see below), whose sum is σ = 3374332416. Its totient is φ = 302572800.

The previous prime is 1242257207. The next prime is 1242257309. The reversal of 1242257250 is 527522421.

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 63 ways as a sum of consecutive naturals, for example, 1003632 + ... + 1004868.

It is an arithmetic number, because the mean of its divisors is an integer number (26361972).

Almost surely, 2^1242257250 is an apocalyptic number.

1242257250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1242257250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1687166208).

1242257250 is an abundant number, since it is smaller than the sum of its proper divisors (2132075166).

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

1242257250 is a wasteful number, since it uses less digits than its factorization.

1242257250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373 (or 1363 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 30.

The square root of 1242257250 is about 35245.6699468176. The cubic root of 1242257250 is about 1074.9885702769.

Adding to 1242257250 its reverse (527522421), we get a palindrome (1769779671).

The spelling of 1242257250 in words is "one billion, two hundred forty-two million, two hundred fifty-seven thousand, two hundred fifty".