1978507 has 2 divisors, whose sum is σ = 1978508. Its totient is φ = 1978506.

The previous prime is 1978469. The next prime is 1978523. The reversal of 1978507 is 7058791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1978507 - 2¹⁵ = 1945739 is a prime.

It is not a weakly prime, because it can be changed into another prime (1978567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989253 + 989254.

It is an arithmetic number, because the mean of its divisors is an integer number (989254).

2^1978507 is an apocalyptic number.

1978507 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978507 is an equidigital number, since it uses as much as digits as its factorization.

1978507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 1978507 is about 1406.5941134528. The cubic root of 1978507 is about 125.5391538284.

It can be divided in two parts, 1978 and 507, that added together give a triangular number (2485 = T₇₀).

The spelling of 1978507 in words is "one million, nine hundred seventy-eight thousand, five hundred seven".