42920549 has 4 divisors (see below), whose sum is σ = 49052064. Its totient is φ = 36789036.

The previous prime is 42920543. The next prime is 42920557. The reversal of 42920549 is 94502924.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42920549 is a prime.

It is a super-2 number, since 2×42920549² = 3684347052922802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42920543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3065747 + ... + 3065760.

It is an arithmetic number, because the mean of its divisors is an integer number (12263016).

Almost surely, 2^42920549 is an apocalyptic number.

It is an amenable number.

42920549 is a deficient number, since it is larger than the sum of its proper divisors (6131515).

42920549 is an equidigital number, since it uses as much as digits as its factorization.

42920549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6131514.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 42920549 is about 6551.3776413820. The cubic root of 42920549 is about 350.1238989921.

The spelling of 42920549 in words is "forty-two million, nine hundred twenty thousand, five hundred forty-nine".