1142247400 has 48 divisors (see below), whose sum is σ = 3035118240. Its totient is φ = 391627200.

The previous prime is 1142247397. The next prime is 1142247401. The reversal of 1142247400 is 47422411.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (1142247401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 406546 + ... + 409345.

It is an arithmetic number, because the mean of its divisors is an integer number (63231630).

Almost surely, 2^1142247400 is an apocalyptic number.

1142247400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1142247400 is an abundant number, since it is smaller than the sum of its proper divisors (1892870840).

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

1142247400 is a wasteful number, since it uses less digits than its factorization.

1142247400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815914 (or 815905 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 1142247400 is about 33797.1507674833. The cubic root of 1142247400 is about 1045.3299477792.

Adding to 1142247400 its reverse (47422411), we get a palindrome (1189669811).

The spelling of 1142247400 in words is "one billion, one hundred forty-two million, two hundred forty-seven thousand, four hundred".