1402978 has 4 divisors (see below), whose sum is σ = 2104470. Its totient is φ = 701488.

The previous prime is 1402957. The next prime is 1403009. The reversal of 1402978 is 8792041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8792041 = 19 ⋅462739.

It can be written as a sum of positive squares in only one way, i.e., 1159929 + 243049 = 1077^2 + 493^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 350743 + ... + 350746.

2^1402978 is an apocalyptic number.

1402978 is a deficient number, since it is larger than the sum of its proper divisors (701492).

1402978 is an equidigital number, since it uses as much as digits as its factorization.

1402978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701491.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1402978 is about 1184.4737227984. The cubic root of 1402978 is about 111.9481584057.

The spelling of 1402978 in words is "one million, four hundred two thousand, nine hundred seventy-eight".