1973640446 has 4 divisors (see below), whose sum is σ = 2960460672. Its totient is φ = 986820222.

The previous prime is 1973640397. The next prime is 1973640467. The reversal of 1973640446 is 6440463791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6440463791 = 4951 ⋅1300841.

It is a super-2 number, since 2×1973640446² = 7790513220174157832, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1973640397 and 1973640406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493410110 + ... + 493410113.

It is an arithmetic number, because the mean of its divisors is an integer number (740115168).

Almost surely, 2^1973640446 is an apocalyptic number.

1973640446 is a deficient number, since it is larger than the sum of its proper divisors (986820226).

1973640446 is an equidigital number, since it uses as much as digits as its factorization.

1973640446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986820225.

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 1973640446 is about 44425.6732757085. The cubic root of 1973640446 is about 1254.3613933798.

The spelling of 1973640446 in words is "one billion, nine hundred seventy-three million, six hundred forty thousand, four hundred forty-six".