42705390 has 64 divisors (see below), whose sum is σ = 126153216. Its totient is φ = 9009792.

The previous prime is 42705389. The next prime is 42705419. The reversal of 42705390 is 9350724.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5092 + ... + 10551.

It is an arithmetic number, because the mean of its divisors is an integer number (1971144).

Almost surely, 2^42705390 is an apocalyptic number.

42705390 is an abundant number, since it is smaller than the sum of its proper divisors (83447826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42705390 is a wasteful number, since it uses less digits than its factorization.

42705390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15673.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 42705390 is about 6534.9361129241. The cubic root of 42705390 is about 349.5378662659.

The spelling of 42705390 in words is "forty-two million, seven hundred five thousand, three hundred ninety".