1440428157 has 32 divisors (see below), whose sum is σ = 2488608000. Its totient is φ = 823096512.

The previous prime is 1440428123. The next prime is 1440428159. The reversal of 1440428157 is 7518240441.

It is a happy number.

It is not a de Polignac number, because 1440428157 - 2¹⁰ = 1440427133 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440428159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68508 + ... + 87029.

It is an arithmetic number, because the mean of its divisors is an integer number (77769000).

Almost surely, 2^1440428157 is an apocalyptic number.

It is an amenable number.

1440428157 is a deficient number, since it is larger than the sum of its proper divisors (1048179843).

1440428157 is an equidigital number, since it uses as much as digits as its factorization.

1440428157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155567 (or 155547 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 1440428157 is about 37952.9729665543. The cubic root of 1440428157 is about 1129.3551433342.

Adding to 1440428157 its reverse (7518240441), we get a palindrome (8958668598).

The spelling of 1440428157 in words is "one billion, four hundred forty million, four hundred twenty-eight thousand, one hundred fifty-seven".