1525420042 has 4 divisors (see below), whose sum is σ = 2288130066. Its totient is φ = 762710020.

The previous prime is 1525420037. The next prime is 1525420049. The reversal of 1525420042 is 2400245251.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1400181561 + 125238481 = 37419^2 + 11191^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1525419989 and 1525420016.

It is not an unprimeable number, because it can be changed into a prime (1525420049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 381355009 + ... + 381355012.

Almost surely, 2^1525420042 is an apocalyptic number.

1525420042 is a deficient number, since it is larger than the sum of its proper divisors (762710024).

1525420042 is an equidigital number, since it uses as much as digits as its factorization.

1525420042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762710023.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 1525420042 is about 39056.6260959648. The cubic root of 1525420042 is about 1151.1444289792.

Adding to 1525420042 its reverse (2400245251), we get a palindrome (3925665293).

The spelling of 1525420042 in words is "one billion, five hundred twenty-five million, four hundred twenty thousand, forty-two".