42102745 has 8 divisors (see below), whose sum is σ = 50909760. Its totient is φ = 33424560.

The previous prime is 42102721. The next prime is 42102773. The reversal of 42102745 is 54720124.

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

It is a de Polignac number, because none of the positive numbers 2^k-42102745 is a prime.

It is a super-2 number, since 2×42102745² = 3545282273070050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31485 + ... + 32794.

It is an arithmetic number, because the mean of its divisors is an integer number (6363720).

Almost surely, 2^42102745 is an apocalyptic number.

It is an amenable number.

42102745 is a deficient number, since it is larger than the sum of its proper divisors (8807015).

42102745 is a wasteful number, since it uses less digits than its factorization.

42102745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64415.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 42102745 is about 6488.6628052319. The cubic root of 42102745 is about 347.8858815714.

Adding to 42102745 its reverse (54720124), we get a palindrome (96822869).

The spelling of 42102745 in words is "forty-two million, one hundred two thousand, seven hundred forty-five".