1250400042 has 24 divisors (see below), whose sum is σ = 2775279780. Its totient is φ = 406633920.

The previous prime is 1250400023. The next prime is 1250400043. The reversal of 1250400042 is 2400040521.

It can be written as a sum of positive squares in 2 ways, for example, as 1249551801 + 848241 = 35349^2 + 921^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1250399988 and 1250400024.

It is not an unprimeable number, because it can be changed into a prime (1250400043) 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, 846417 + ... + 847892.

Almost surely, 2^1250400042 is an apocalyptic number.

1250400042 is an abundant number, since it is smaller than the sum of its proper divisors (1524879738).

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

1250400042 is a wasteful number, since it uses less digits than its factorization.

1250400042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694358 (or 1694355 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 1250400042 is about 35360.9960549756. The cubic root of 1250400042 is about 1077.3322480075.

Adding to 1250400042 its reverse (2400040521), we get a palindrome (3650440563).

The spelling of 1250400042 in words is "one billion, two hundred fifty million, four hundred thousand, forty-two".