1977294690 has 48 divisors (see below), whose sum is σ = 5875391808. Its totient is φ = 451952928.

The previous prime is 1977294673. The next prime is 1977294707. The reversal of 1977294690 is 964927791.

It is an interprime number because it is at equal distance from previous prime (1977294673) and next prime (1977294707).

It is a super-2 number, since 2×1977294690² = 7819388582204392200, which contains 22 as substring.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1568652 + ... + 1569911.

It is an arithmetic number, because the mean of its divisors is an integer number (122403996).

Almost surely, 2^1977294690 is an apocalyptic number.

1977294690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1977294690 is an abundant number, since it is smaller than the sum of its proper divisors (3898097118).

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

1977294690 is a wasteful number, since it uses less digits than its factorization.

1977294690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3138583 (or 3138580 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 54.

The square root of 1977294690 is about 44466.7818714150. The cubic root of 1977294690 is about 1255.1350764385.

The spelling of 1977294690 in words is "one billion, nine hundred seventy-seven million, two hundred ninety-four thousand, six hundred ninety".