1425644738 has 16 divisors (see below), whose sum is σ = 2444830080. Its totient is φ = 610773696.

The previous prime is 1425644729. The next prime is 1425644761. The reversal of 1425644738 is 8374465241.

It is a happy number.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26570 + ... + 59642.

It is an arithmetic number, because the mean of its divisors is an integer number (152801880).

Almost surely, 2^1425644738 is an apocalyptic number.

1425644738 is a deficient number, since it is larger than the sum of its proper divisors (1019185342).

1425644738 is a wasteful number, since it uses less digits than its factorization.

1425644738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36161.

The product of its digits is 645120, while the sum is 44.

The square root of 1425644738 is about 37757.7109740514. The cubic root of 1425644738 is about 1125.4782461795.

The spelling of 1425644738 in words is "one billion, four hundred twenty-five million, six hundred forty-four thousand, seven hundred thirty-eight".