42391465 has 8 divisors (see below), whose sum is σ = 51567048. Its totient is φ = 33448320.

The previous prime is 42391463. The next prime is 42391471. The reversal of 42391465 is 56419324.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1597696 + 40793769 = 1264^2 + 6387^2 .

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

It is not a de Polignac number, because 42391465 - 2¹ = 42391463 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42391465.

It is not an unprimeable number, because it can be changed into a prime (42391463) 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, 57706 + ... + 58435.

It is an arithmetic number, because the mean of its divisors is an integer number (6445881).

Almost surely, 2^42391465 is an apocalyptic number.

It is an amenable number.

42391465 is a deficient number, since it is larger than the sum of its proper divisors (9175583).

42391465 is a wasteful number, since it uses less digits than its factorization.

42391465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116219.

The product of its digits is 25920, while the sum is 34.

The square root of 42391465 is about 6510.8728293525. The cubic root of 42391465 is about 348.6792810620.

The spelling of 42391465 in words is "forty-two million, three hundred ninety-one thousand, four hundred sixty-five".