1257440442 has 32 divisors (see below), whose sum is σ = 2541464640. Its totient is φ = 414735360.

The previous prime is 1257440441. The next prime is 1257440461. The reversal of 1257440442 is 2440447521.

It is a super-3 number, since 3×1257440442³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1257440441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291034 + ... + 295322.

It is an arithmetic number, because the mean of its divisors is an integer number (79420770).

Almost surely, 2^1257440442 is an apocalyptic number.

1257440442 is an abundant number, since it is smaller than the sum of its proper divisors (1284024198).

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

1257440442 is a wasteful number, since it uses less digits than its factorization.

1257440442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4798.

The product of its (nonzero) digits is 35840, while the sum is 33.

The square root of 1257440442 is about 35460.4066812551. The cubic root of 1257440442 is about 1079.3504444574.

Adding to 1257440442 its reverse (2440447521), we get a palindrome (3697887963).

The spelling of 1257440442 in words is "one billion, two hundred fifty-seven million, four hundred forty thousand, four hundred forty-two".