1977240 has 32 divisors (see below), whose sum is σ = 5932080. Its totient is φ = 527232.

The previous prime is 1977233. The next prime is 1977251. The reversal of 1977240 is 427791.

1977240 = T₁₆₃ + T₁₆₄ + ... + T₂₅₂.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1977198 and 1977207.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8119 + ... + 8358.

2^1977240 is an apocalyptic number.

1977240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1977240 is an abundant number, since it is smaller than the sum of its proper divisors (3954840).

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

1977240 is a wasteful number, since it uses less digits than its factorization.

1977240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16491 (or 16487 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 1977240 is about 1406.1436626462. The cubic root of 1977240 is about 125.5123504403.

The spelling of 1977240 in words is "one million, nine hundred seventy-seven thousand, two hundred forty".