1978480437 has 8 divisors (see below), whose sum is σ = 2639394336. Its totient is φ = 1318276752.

The previous prime is 1978480433. The next prime is 1978480477. The reversal of 1978480437 is 7340848791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1978480437 - 2² = 1978480433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1978480437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978480433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171018 + ... + 182219.

It is an arithmetic number, because the mean of its divisors is an integer number (329924292).

Almost surely, 2^1978480437 is an apocalyptic number.

It is an amenable number.

1978480437 is a deficient number, since it is larger than the sum of its proper divisors (660913899).

1978480437 is a wasteful number, since it uses less digits than its factorization.

1978480437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355107.

The product of its (nonzero) digits is 1354752, while the sum is 51.

The square root of 1978480437 is about 44480.1128258461. The cubic root of 1978480437 is about 1255.3859200552.

The spelling of 1978480437 in words is "one billion, nine hundred seventy-eight million, four hundred eighty thousand, four hundred thirty-seven".