1252440406 has 16 divisors (see below), whose sum is σ = 2149714080. Its totient is φ = 536091840.

The previous prime is 1252440401. The next prime is 1252440451. The reversal of 1252440406 is 6040442521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252440401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43965 + ... + 66616.

It is an arithmetic number, because the mean of its divisors is an integer number (134357130).

Almost surely, 2^1252440406 is an apocalyptic number.

1252440406 is a deficient number, since it is larger than the sum of its proper divisors (897273674).

1252440406 is a wasteful number, since it uses less digits than its factorization.

1252440406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111399.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 1252440406 is about 35389.8347834516. The cubic root of 1252440406 is about 1077.9179153458.

Adding to 1252440406 its reverse (6040442521), we get a palindrome (7292882927).

The spelling of 1252440406 in words is "one billion, two hundred fifty-two million, four hundred forty thousand, four hundred six".