1978429914 has 32 divisors (see below), whose sum is σ = 4498760640. Its totient is φ = 644139216.

The previous prime is 1978429913. The next prime is 1978429919. The reversal of 1978429914 is 4199248791.

It is a super-2 number, since 2×1978429914² = 7828369849220094792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1978429913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 423697 + ... + 428340.

It is an arithmetic number, because the mean of its divisors is an integer number (140586270).

Almost surely, 2^1978429914 is an apocalyptic number.

1978429914 is an abundant number, since it is smaller than the sum of its proper divisors (2520330726).

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

1978429914 is a wasteful number, since it uses less digits than its factorization.

1978429914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852091 (or 852085 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 1978429914 is about 44479.5448942545. The cubic root of 1978429914 is about 1255.3752340086.

The spelling of 1978429914 in words is "one billion, nine hundred seventy-eight million, four hundred twenty-nine thousand, nine hundred fourteen".