978949641 has 20 divisors (see below), whose sum is σ = 1387199312. Its totient is φ = 614085696.

The previous prime is 978949619. The next prime is 978949691. The reversal of 978949641 is 146949879.

It is not a de Polignac number, because 978949641 - 2⁷ = 978949513 is a prime.

It is a super-2 number, since 2×978949641² = 1916684799228057762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978949691) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 248610 + ... + 252516.

Almost surely, 2^978949641 is an apocalyptic number.

It is an amenable number.

978949641 is a deficient number, since it is larger than the sum of its proper divisors (408249671).

978949641 is an frugal number, since it uses more digits than its factorization.

978949641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3978 (or 3927 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 57.

The square root of 978949641 is about 31288.1709436650. The cubic root of 978949641 is about 992.9333943798.

The spelling of 978949641 in words is "nine hundred seventy-eight million, nine hundred forty-nine thousand, six hundred forty-one".