1820377670440 has 64 divisors (see below), whose sum is σ = 4708028914560. Its totient is φ = 620521785600.

The previous prime is 1820377670437. The next prime is 1820377670443. The reversal of 1820377670440 is 440767730281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1820377670437) and next prime (1820377670443).

It is a super-2 number, since 2×1820377670440² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1820377670443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18741586 + ... + 18838465.

It is an arithmetic number, because the mean of its divisors is an integer number (73562951790).

Almost surely, 2^{1820377670440} is an apocalyptic number.

1820377670440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820377670440 is an abundant number, since it is smaller than the sum of its proper divisors (2887651244120).

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

1820377670440 is a wasteful number, since it uses less digits than its factorization.

1820377670440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37580242 (or 37580238 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 49.

The spelling of 1820377670440 in words is "one trillion, eight hundred twenty billion, three hundred seventy-seven million, six hundred seventy thousand, four hundred forty".