1977994242 has 224 divisors, whose sum is σ = 5420580480. Its totient is φ = 529079040.

The previous prime is 1977994231. The next prime is 1977994253. The reversal of 1977994242 is 2424997791.

It is an interprime number because it is at equal distance from previous prime (1977994231) and next prime (1977994253).

It is a super-2 number, since 2×1977994242² = 7824922442770309128, which contains 22 as substring.

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

It is a cake number, because a cake can be divided into 1977994242 parts by 2281 planar cuts.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 12134853 + ... + 12135015.

It is an arithmetic number, because the mean of its divisors is an integer number (24199020).

Almost surely, 2^1977994242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1977994242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2710290240).

1977994242 is an abundant number, since it is smaller than the sum of its proper divisors (3442586238).

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

1977994242 is a wasteful number, since it uses less digits than its factorization.

1977994242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 245 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 1977994242 is about 44474.6471824117. The cubic root of 1977994242 is about 1255.2830781047.

The spelling of 1977994242 in words is "one billion, nine hundred seventy-seven million, nine hundred ninety-four thousand, two hundred forty-two".