42920257 has 6 divisors (see below), whose sum is σ = 45593798. Its totient is φ = 40395264.

The previous prime is 42920209. The next prime is 42920263. The reversal of 42920257 is 75202924.

It can be written as a sum of positive squares in 3 ways, for example, as 3682561 + 39237696 = 1919^2 + 6264^2 .

It is not a de Polignac number, because 42920257 - 2¹⁵ = 42887489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42920287) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73968 + ... + 74545.

Almost surely, 2^42920257 is an apocalyptic number.

It is an amenable number.

42920257 is a deficient number, since it is larger than the sum of its proper divisors (2673541).

42920257 is a wasteful number, since it uses less digits than its factorization.

42920257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148547 (or 148530 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 42920257 is about 6551.3553559550. The cubic root of 42920257 is about 350.1231049947.

The spelling of 42920257 in words is "forty-two million, nine hundred twenty thousand, two hundred fifty-seven".