1377521100 has 144 divisors (see below), whose sum is σ = 4548493600. Its totient is φ = 357384960.

The previous prime is 1377521081. The next prime is 1377521111. The reversal of 1377521100 is 11257731.

It is a happy number.

1377521100 is a `hidden beast` number, since 1 + 37 + 7 + 521 + 100 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 93006 + ... + 106794.

Almost surely, 2^1377521100 is an apocalyptic number.

1377521100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1377521100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2274246800).

1377521100 is an abundant number, since it is smaller than the sum of its proper divisors (3170972500).

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

1377521100 is a wasteful number, since it uses less digits than its factorization.

1377521100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13849 (or 13836 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 27.

The square root of 1377521100 is about 37114.9713727493. The cubic root of 1377521100 is about 1112.6692516975.

Adding to 1377521100 its reverse (11257731), we get a palindrome (1388778831).

Subtracting from 1377521100 its reverse (11257731), we obtain a square (1366263369 = 36963²).

The spelling of 1377521100 in words is "one billion, three hundred seventy-seven million, five hundred twenty-one thousand, one hundred".