2157770 has 16 divisors (see below), whose sum is σ = 3967488. Its totient is φ = 844560.

The previous prime is 2157769. The next prime is 2157787. The reversal of 2157770 is 777512.

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, 1826 + ... + 2765.

It is an arithmetic number, because the mean of its divisors is an integer number (247968).

2^2157770 is an apocalyptic number.

2157770 is a deficient number, since it is larger than the sum of its proper divisors (1809718).

2157770 is a wasteful number, since it uses less digits than its factorization.

2157770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4645.

The product of its (nonzero) digits is 3430, while the sum is 29.

The square root of 2157770 is about 1468.9349883504. The cubic root of 2157770 is about 129.2215809976.

The spelling of 2157770 in words is "two million, one hundred fifty-seven thousand, seven hundred seventy".