42739749 has 12 divisors (see below), whose sum is σ = 66484236. Its totient is φ = 26301312.

The previous prime is 42739729. The next prime is 42739757. The reversal of 42739749 is 94793724.

It can be written as a sum of positive squares in 2 ways, for example, as 25250625 + 17489124 = 5025^2 + 4182^2 .

It is not a de Polignac number, because 42739749 - 2¹⁵ = 42706981 is a prime.

It is a super-2 number, since 2×42739749² = 3653372289166002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42739709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 182532 + ... + 182765.

It is an arithmetic number, because the mean of its divisors is an integer number (5540353).

Almost surely, 2^42739749 is an apocalyptic number.

It is an amenable number.

42739749 is a deficient number, since it is larger than the sum of its proper divisors (23744487).

42739749 is a wasteful number, since it uses less digits than its factorization.

42739749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365316 (or 365313 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 42739749 is about 6537.5644547492. The cubic root of 42739749 is about 349.6315823997.

The spelling of 42739749 in words is "forty-two million, seven hundred thirty-nine thousand, seven hundred forty-nine".