42978355 has 16 divisors (see below), whose sum is σ = 59048640. Its totient is φ = 29417472.

The previous prime is 42978317. The next prime is 42978391. The reversal of 42978355 is 55387924.

It is not a de Polignac number, because 42978355 - 2¹⁷ = 42847283 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34707 + ... + 35923.

It is an arithmetic number, because the mean of its divisors is an integer number (3690540).

Almost surely, 2^42978355 is an apocalyptic number.

42978355 is a deficient number, since it is larger than the sum of its proper divisors (16070285).

42978355 is a wasteful number, since it uses less digits than its factorization.

42978355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238.

The product of its digits is 302400, while the sum is 43.

The square root of 42978355 is about 6555.7879007790. The cubic root of 42978355 is about 350.2810124121.

The spelling of 42978355 in words is "forty-two million, nine hundred seventy-eight thousand, three hundred fifty-five".