1949147820 has 48 divisors (see below), whose sum is σ = 6064017120. Its totient is φ = 519772608.

The previous prime is 1949147819. The next prime is 1949147833. The reversal of 1949147820 is 287419491.

It is a happy number.

1949147820 is a `hidden beast` number, since 1 + 94 + 91 + 478 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1804227 + ... + 1805306.

It is an arithmetic number, because the mean of its divisors is an integer number (126333690).

Almost surely, 2^1949147820 is an apocalyptic number.

1949147820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1949147820 is an abundant number, since it is smaller than the sum of its proper divisors (4114869300).

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

1949147820 is a wasteful number, since it uses less digits than its factorization.

1949147820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3609551 (or 3609543 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1949147820 is about 44149.1542387847. The cubic root of 1949147820 is about 1249.1509583665.

It can be divided in two parts, 1949 and 147820, that added together give a square (149769 = 387²).

The spelling of 1949147820 in words is "one billion, nine hundred forty-nine million, one hundred forty-seven thousand, eight hundred twenty".