1978575 has 48 divisors (see below), whose sum is σ = 3618816. Its totient is φ = 950400.

The previous prime is 1978567. The next prime is 1978589. The reversal of 1978575 is 5758791.

1978575 = T₂₇₀ + T₂₇₁ + ... + T₃₁₅.

1978575 = 213² + 214² + ... + 249².

It is not a de Polignac number, because 1978575 - 2³ = 1978567 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53457 + ... + 53493.

It is an arithmetic number, because the mean of its divisors is an integer number (75392).

2^1978575 is an apocalyptic number.

1978575 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1978575 is a deficient number, since it is larger than the sum of its proper divisors (1640241).

1978575 is a wasteful number, since it uses less digits than its factorization.

1978575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 99 counting only the distinct ones).

The product of its digits is 88200, while the sum is 42.

The square root of 1978575 is about 1406.6182851079. The cubic root of 1978575 is about 125.5405920450.

The spelling of 1978575 in words is "one million, nine hundred seventy-eight thousand, five hundred seventy-five".