1978158424 has 32 divisors (see below), whose sum is σ = 4222160640. Its totient is φ = 860068000.

The previous prime is 1978158421. The next prime is 1978158433. The reversal of 1978158424 is 4248518791.

It is a super-2 number, since 2×1978158424² = 7826221500884327552, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978158421) 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, 486652 + ... + 490699.

It is an arithmetic number, because the mean of its divisors is an integer number (131942520).

Almost surely, 2^1978158424 is an apocalyptic number.

It is an amenable number.

1978158424 is an abundant number, since it is smaller than the sum of its proper divisors (2244002216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1978158424 is a wasteful number, since it uses less digits than its factorization.

1978158424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977391 (or 977387 counting only the distinct ones).

The product of its digits is 645120, while the sum is 49.

The square root of 1978158424 is about 44476.4929372809. The cubic root of 1978158424 is about 1255.3178084358.

The spelling of 1978158424 in words is "one billion, nine hundred seventy-eight million, one hundred fifty-eight thousand, four hundred twenty-four".