42404137 has 8 divisors (see below), whose sum is σ = 45149832. Its totient is φ = 39686400.

The previous prime is 42404113. The next prime is 42404147. The reversal of 42404137 is 73140424.

It can be written as a sum of positive squares in 4 ways, for example, as 2322576 + 40081561 = 1524^2 + 6331^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42404137 - 2¹⁵ = 42371369 is a prime.

It is a super-2 number, since 2×42404137² = 3596221669429538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42404147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3814 + ... + 9967.

It is an arithmetic number, because the mean of its divisors is an integer number (5643729).

Almost surely, 2^42404137 is an apocalyptic number.

It is an amenable number.

42404137 is a deficient number, since it is larger than the sum of its proper divisors (2745695).

42404137 is a wasteful number, since it uses less digits than its factorization.

42404137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13979.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 42404137 is about 6511.8458980538. The cubic root of 42404137 is about 348.7140209454.

The spelling of 42404137 in words is "forty-two million, four hundred four thousand, one hundred thirty-seven".