42391025 has 6 divisors (see below), whose sum is σ = 52564902. Its totient is φ = 33912800.

The previous prime is 42391003. The next prime is 42391057. The reversal of 42391025 is 52019324.

It can be written as a sum of positive squares in 3 ways, for example, as 2334784 + 40056241 = 1528^2 + 6329^2 .

It is not a de Polignac number, because 42391025 - 2⁶ = 42390961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42390985 and 42391003.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 847796 + ... + 847845.

It is an arithmetic number, because the mean of its divisors is an integer number (8760817).

Almost surely, 2^42391025 is an apocalyptic number.

It is an amenable number.

42391025 is a deficient number, since it is larger than the sum of its proper divisors (10173877).

42391025 is a wasteful number, since it uses less digits than its factorization.

42391025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695651 (or 1695646 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 42391025 is about 6510.8390396323. The cubic root of 42391025 is about 348.6780746917.

The spelling of 42391025 in words is "forty-two million, three hundred ninety-one thousand, twenty-five".